The device is designed to provide an intermittent sound and light signal to the driver when starting the car with the hand brake. Its connection diagram is shown using the Moskvich-2140 car as an example, but can be done on other car models.
The driver is notified of a violation of the tightness of the hydraulic system of the wheel brake mechanisms and the activation of the hand brake of the Moskvich-2140 car using one warning lamp installed on the instrument panel. When the handbrake is applied, the lamp lights up with a constant light, which does not always attract the driver’s attention, unlike a flashing one, and often even experienced drivers forget to turn off the handbrake when starting and driving the car. This causes increased wear of the brake linings, additional load on the engine and disruption of the adjustment of the handbrake drive system.
The handbrake alarm, the circuit of which is shown in the figure, consists of a sound generator assembled on transistors VT1, VT2, a multivibrator on transistors VT3, VT4 (relay winding K.1 is connected to the collector circuit VT3); additional switch SB2 and standard elements of electrical equipment - ignition key SA1, hydraulic brake tightness sensor SP, switch SB1 of the handbrake warning lamp and warning lamp HL.
Switch SB2 is installed under the clutch pedal, similar to the brake light switch on the foot brake pedal. When you press the clutch pedal, the contacts of switch SB2 close, and when released, they open.
Fig.1. Handbrake warning light. Scheme
The hand brake warning light works as follows. When the ignition switch SA1 is turned on, the +12 V supply voltage is supplied to the HL lamp and terminal 5 of the device. By closing the contacts of switch SB1 (handbrake is on), the multivibrator and signal lamp are connected to the negative power bus via the circuit: minus 12 V, closed contacts of switch SB1, terminal 4 of the device, normally closed contacts K1.1, switch SB2 and through diode VD1 to lamp HL . The multivibrator starts working.
Turning on with a frequency of 1...2 Hz, relay K1, with its normally closed contact K1.1, switches the power supply circuit of the lamp, and when the contacts of switch SB2 are closed (the clutch pedal is pressed), it also switches the power supply circuit of the sound generator. The lamp and generator “produce” intermittent light and sound signal respectively. When the contacts of switch SB1 open (the handbrake is off), the lamp and multivibrator are de-energized.
When the SP switch is triggered (the seal of the hydraulic drive is broken), the warning lamp will emit a constant light as usual with this malfunction. The indication of the engaged state of the handbrake when the clutch pedal is pressed will be the same - an intermittent sound signal. This is achieved by separating the circuit of the SP switch and the negative power bus of the device with a counter-connected diode VD1, i.e. minus 12 V can be supplied to the device only through terminal 4 and closing the contacts of the SP switch does not affect the operation of the device.
In table Figure 1 shows the states of the indicators when the driver operates the handbrake (switch SB1) and the clutch pedal (switch SB2) when starting and driving the car with normal and broken hydraulic brake seals. The handbrake warning light is connected by terminals 1, 2 to the clutch pedal switch SB2, and by terminal 3 to the contact of the SP switch freed from the conductor (a) (see Fig. 2). The disconnected conductor(s) of switch SB1 is connected to terminal 4, terminal 5 to the +12 V power bus.
Table 1
The handbrake alarm uses MP25 transistors with a static current transfer coefficient of 20...35, capacitors - C1, C2 - MBM, SZ - K50-6, MLT resistors, RES-15 relay (passport RS4.591.003.P2), sound emitter -DEMSH-1A capsule, SB2 switch-MP-1 microswitch with corresponding fastening elements.
Instead of the above, you can use transistors MP26, MP39, MP40 with a current transfer coefficient of at least 20, diodes D7A, D226 and D220, D9Zh, E, relays of any type with an operating current of no more than 30...50 mA and a supply voltage of 12 V. Correct The assembled and connected hand brake warning light does not require adjustment. All its elements are located on printed circuit board and placed in a metal case. The installation and relative position of semiconductor elements are not critical. The dimensions depend mainly on the type of relay and sound emitter used. Long-term operation of the alarm has shown its reliability, convenience and necessity.
The proposed device is designed to provide an intermittent sound and light signal to the driver when starting a car with the hand brake on. Its connection diagram is shown using the Moskvich-2140 car as an example, but can be done on other car models.
The driver is notified of a violation of the tightness of the hydraulic system of the wheel brake mechanisms and the activation of the hand brake of the Moskvich-2140 car using one warning lamp installed on the instrument panel. When the handbrake is applied, the lamp lights up with a constant light, which does not always attract the driver’s attention, unlike a flashing one, and often even experienced drivers forget to turn off the handbrake when starting and driving the car. This causes increased wear of the brake linings, additional load on the engine and disruption of the adjustment of the handbrake drive system.
The device, the circuit of which is shown in the figure, consists of a sound generator assembled on transistors VT1, VT2, a multivibrator on transistors VT3, VT4 (relay winding K.1 is connected to the collector circuit VT3); additional switch SB2 and standard elements of electrical equipment - ignition key SA1, hydraulic brake tightness sensor SP, switch SB1 of the handbrake warning lamp and warning lamp HL.
Switch SB2 is installed under the clutch pedal, similar to the brake light switch on the foot brake pedal. When you press the clutch pedal, the contacts of switch SB2 close, and when released, they open.
The device works as follows. When the ignition switch SA1 is turned on, the +12 V supply voltage is supplied to the HL lamp and terminal 5 of the device. By closing the contacts of switch SB1 (handbrake is on), the multivibrator and signal lamp are connected to the negative power bus via the circuit: minus 12 V, closed contacts of switch SB1, terminal 4 of the device, normally closed contacts K1.1, switch SB2 and through diode VD1 to lamp HL . The multivibrator starts working.
Turning on with a frequency of 1...2 Hz, relay K1, with its normally closed contact K1.1, switches the power supply circuit of the lamp, and when the contacts of switch SB2 are closed (the clutch pedal is pressed), it also switches the power circuit of the sound generator.
The lamp and the generator “produce” an intermittent light and sound signal, respectively. When the contacts of switch SB1 open (the handbrake is off), the lamp and multivibrator are de-energized.
When the SP switch is triggered (the seal of the hydraulic drive is broken), the warning lamp will emit a constant light as usual with this malfunction. The indication of the engaged state of the handbrake when the clutch pedal is pressed will be the same - an intermittent sound signal. This is achieved by separating the circuit of the SP switch and the negative power bus of the device with a counter-connected diode VD1, i.e. minus 12 V can be supplied to the device only through terminal 4 and closing the contacts of the SP switch does not affect the operation of the device.
In table Figure 1 shows the states of the indicators when the driver operates the handbrake (switch SB1) and the clutch pedal (switch SB2) when starting and driving the car with normal and broken hydraulic brake seals.
The device is connected by terminals 1, 2 to the clutch pedal switch SB2, by terminal 3 to the contact of the SP switch freed from the conductor (a) (see Fig. 2). The disconnected conductor(s) of switch SB1 is connected to terminal 4, terminal 5 to the +12 V power bus.
Table 1
| Situation | light indication HL | sound indication HA | |
| 1 | Power off | 0 | 0 |
| Normal tightness of the hydraulic brake drive | |||
| 2 | Handbrake is on, car is parked | X | 0 |
| 3 | Starting and driving the car with the handbrake off | 0 | 0 |
| 4 | X | X | |
| 5 | X | 0 | |
| Violation of the tightness of the hydraulic brake drive | |||
| 6 | Handbrake is on (off), car is parked | + | 0 |
| 7 | Starting and driving a car with the handbrake off | + | 0 |
| 8 | Moving the car with the handbrake on | + | X |
| 9 | Driving a car with the handbrake on | + | 0 |
| Note: 0 – no indication; X – intermittent indication; + display is constant. | |||
The device uses MP25 transistors with a static current transfer coefficient of 20...35, capacitors - C1, C2 - MBM, SZ - K50-6, MLT resistors, RES-15 relay (passport RS4.591.003.P2), sound emitter-capsule DEMSh- 1A, switch SB2-microswitch MP-1 with corresponding fastening elements.
Instead of the above, you can use transistors MP26, MP39, MP40 with a current transfer coefficient of at least 20, diodes D7A, D226 and D220, D9Zh, E, relays of any type with an operating current of no more than 30...50 mA and a supply voltage of 12 V.
A correctly assembled and connected device does not require configuration. All its elements are located on a printed circuit board and placed in a metal case.
The installation and relative position of semiconductor elements are not critical. The dimensions depend mainly on the type of relay and sound emitter used.
Long-term operation of the device has shown its reliability, convenience and necessity.
The proposed device is designed to provide an intermittent sound and light signal to the driver when starting a car with the hand brake on. Its connection diagram is shown using the Moskvich-2140 car as an example, but can be done on other car models.
The driver is notified of a violation of the tightness of the hydraulic system of the wheel brake mechanisms and the activation of the hand brake of the Moskvich-2140 car using one warning lamp installed on the instrument panel. When the handbrake is applied, the lamp lights up with a constant light, which does not always attract the driver’s attention, unlike a flashing one, and often even experienced drivers forget to turn off the handbrake when starting and driving the car. This causes increased wear of the brake linings, additional load on the engine and disruption of the adjustment of the handbrake drive system.
The device, the circuit of which is shown in the figure, consists of a sound generator assembled on transistors VT1, VT2, a multivibrator on transistors VT3, VT4 (relay winding K.1 is connected to the collector circuit VT3); additional switch SB2 and standard elements of electrical equipment - ignition key SA1, hydraulic brake tightness sensor SP, switch SB1 of the handbrake warning lamp and warning lamp HL.
Switch SB2 is installed under the clutch pedal, similar to the brake light switch on the foot brake pedal. When you press the clutch pedal, the contacts of switch SB2 close, and when released, they open.
The device works as follows. When the ignition switch SA1 is turned on, the +12 V supply voltage is supplied to the HL lamp and terminal 5 of the device. By closing the contacts of switch SB1 (handbrake is on), the multivibrator and signal lamp are connected to the negative power bus via the circuit: minus 12 V, closed contacts of switch SB1, terminal 4 of the device, normally closed contacts K1.1, switch SB2 and through diode VD1 to lamp HL . The multivibrator starts working.
Turning on with a frequency of 1...2 Hz, relay K1, with its normally closed contact K1.1, switches the power supply circuit of the lamp, and when the contacts of switch SB2 are closed (the clutch pedal is pressed), it also switches the power supply circuit of the sound generator.
The lamp and the generator “produce” an intermittent light and sound signal, respectively. When the contacts of switch SB1 open (the handbrake is off), the lamp and multivibrator are de-energized.
When the SP switch is triggered (the seal of the hydraulic drive is broken), the warning lamp will emit a constant light as usual with this malfunction. The indication of the engaged state of the handbrake when the clutch pedal is pressed will be the same - an intermittent sound signal. This is achieved by separating the circuit of the SP switch and the negative power bus of the device with a counter-connected diode VD1, i.e. minus 12 V can be supplied to the device only through terminal 4 and closing the contacts of the SP switch does not affect the operation of the device.
In table Figure 1 shows the states of the indicators when the driver operates the handbrake (switch SB1) and the clutch pedal (switch SB2) when starting and driving the car with normal and broken hydraulic brake seals.
The device is connected by terminals 1, 2 to the clutch pedal switch SB2, by terminal 3 to the contact of the SP switch freed from the conductor (a) (see Fig. 2). The disconnected conductor(s) of switch SB1 is connected to terminal 4, terminal 5 to the +12 V power bus.
Table 1
|
Situation |
light indication HL |
sound indication HA |
|
| 1 | Power off | ||
|
Normal tightness of the hydraulic brake drive |
|||
| 2 | Handbrake is on, car is parked | ||
| 3 | Starting and driving the car with the handbrake off | ||
| 4 | |||
| 5 | |||
|
Violation of the tightness of the hydraulic brake drive |
|||
| 6 | Handbrake is on (off), car is parked | ||
| 7 | Starting and driving a car with the handbrake off | ||
| 8 | Moving the car with the handbrake on | ||
| 9 | Driving a car with the handbrake on |
Note: 0 - no indication; X - intermittent indication; + display is constant.
The device uses MP25 transistors with a static current transfer coefficient of 20...35, capacitors - C1, C2 - MBM, SZ - K50-6, MLT resistors, RES-15 relay (passport RS4.591.003.P2), sound emitter capsule DEMSH-1A, switch SB2-microswitch MP-1 with corresponding fastening elements.
Instead of the above, you can use transistors MP26, MP39, MP40 with a current transfer coefficient of at least 20, diodes D7A, D226 and D220, D9Zh, E, relays of any type with an operating current of no more than 30...50 mA and a supply voltage of 12 V.
A correctly assembled and connected device does not require configuration. All its elements are located on a printed circuit board and placed in a metal case.
The installation and relative position of semiconductor elements are not critical. The dimensions depend mainly on the type of relay and sound emitter used.
Long-term operation of the device has shown its reliability, convenience and necessity.
List of radioelements
| Designation | Type | Denomination | Quantity | Note | Shop | My notepad |
|---|---|---|---|---|---|---|
| VT1-VT4 | Bipolar transistor | MP25A | 4 | MP26, MP39, MP40 | To notepad | |
| VD1 | Diode | KD208A | 1 | D7A, D226 | To notepad | |
| VD2 | Diode | D223 | 1 | D9Zh, D220 | To notepad | |
| C1, C2 | Capacitor | 0.1 µF | 2 | MBM | To notepad | |
| C3 | Electrolytic capacitor | 20 µF 6V | 1 | K50-6 | To notepad | |
| R1, R2 | Resistor | 18 kOhm | 2 | 0.25 W | To notepad | |
| R3 | Resistor | 1 kOhm | 1 | 0.25 W | To notepad | |
| R4 | Resistor | 1.5 kOhm | 1 | 0.25 W |
The proposed device is designed to provide an intermittent sound and light signal to the driver when starting a car with the hand brake on.
Its connection diagram is shown using the Moskvich-2140 car as an example, but can be done on other car models.
Handbrake warning light
The driver is notified of a violation of the tightness of the hydraulic system of the wheel brake mechanisms and the activation of the hand brake of the Moskvich-2140 car using one warning lamp installed on the instrument panel. When the handbrake is applied, the lamp lights up with a constant light, which does not always attract the driver’s attention, unlike a flashing one, and often even experienced drivers forget to turn off the handbrake when starting and driving the car. This causes increased wear of the brake linings, additional load on the engine and disruption of the adjustment of the handbrake drive system.
The device, the circuit of which is shown in the figure, consists of a sound generator assembled on transistors VT1, VT2, a multivibrator on transistors VT3, VT4 (relay winding K.1 is connected to the collector circuit VT3); additional switch SB2 and standard elements of electrical equipment - ignition key SA1, hydraulic brake tightness sensor SP, switch SB1 of the handbrake warning lamp and warning lamp HL.
- Switch SB2 is installed under the clutch pedal, similar to the brake light switch on the foot brake pedal. When you press the clutch pedal, the contacts of switch SB2 close, and when released, they open.
- The device works as follows. When the ignition switch SA1 is turned on, the +12 V supply voltage is supplied to the HL lamp and terminal 5 of the device.
- The lamp and the generator “produce” an intermittent light and sound signal, respectively. When the contacts of switch SB1 open (the handbrake is off), the lamp and multivibrator are de-energized.
- When the SP switch is triggered (the seal of the hydraulic drive is broken), the warning lamp will emit a constant light as usual with this malfunction. The indication of the engaged state of the handbrake when the clutch pedal is pressed will be the same - an intermittent sound signal. This is achieved by separating the circuit of the SP switch and the negative power bus of the device with a counter-connected diode VD1, i.e. minus 12 V can be supplied to the device only through terminal 4 and closing the contacts of the SP switch does not affect the operation of the device.
In table Figure 1 shows the states of the indicators when the driver operates the handbrake (switch SB1) and the clutch pedal (switch SB2) when starting and driving the car with normal and broken hydraulic brake seals.
The device is connected by terminals 1, 2 to the clutch pedal switch SB2, by terminal 3 to the contact of the SP switch freed from the conductor (a) (see Fig. 2). The disconnected conductor(s) of switch SB1 is connected to terminal 4, terminal 5 to the +12 V power bus.
Table 1
Situation |
light indication HL |
sound indication HA |
|
| 1 | Power off | ||
Normal tightness of the hydraulic brake drive |
|||
| 2 | Handbrake is on, car is parked | ||
| 3 | Starting and driving the car with the handbrake off | ||
| 4 | |||
| 5 | |||
Violation of the tightness of the hydraulic brake drive |
|||
| 6 | Handbrake is on (off), car is parked | ||
| 7 | Starting and driving a car with the handbrake off | ||
| 8 | Moving the car with the handbrake on | ||
| 9 | Driving a car with the handbrake on | ||
| Note: 0 - no indication; X - intermittent indication; + display is constant. | |||
The device uses MP25 transistors with a static current transfer coefficient of 20...35, capacitors - C1, C2 - MBM, SZ - K50-6, MLT resistors, RES-15 relay (passport RS4.591.003.P2), sound emitter capsule DEMSH-1A, switch SB2-microswitch MP-1 with corresponding fastening elements.
- Instead of the above, you can use transistors MP26, MP39, MP40 with a current transfer coefficient of at least 20, diodes D7A, D226 and D220, D9Zh, E, relays of any type with an operating current of no more than 30...50 mA and a supply voltage of 12 V.
- A correctly assembled and connected device does not require configuration. All its elements are located on a printed circuit board and placed in a metal case.
- The installation and relative position of semiconductor elements are not critical.
The dimensions depend mainly on the type of relay and sound emitter used.
Long-term operation of the device has shown its reliability, convenience and necessity.
A. KUZEMA, VRL, issue 93
The driver is notified of a violation of the tightness of the hydraulic system of the wheel brake mechanisms and the activation of the hand brake of the Moskvich-2140 car using one warning lamp installed on the instrument panel. When the handbrake is applied, the lamp lights up with a constant light, which does not always attract the driver’s attention, unlike a flashing one, and often even experienced drivers forget to turn off the handbrake when starting and driving the car. This causes increased wear of the brake linings, additional load on the engine and disruption of the adjustment of the handbrake drive system.
The proposed device is designed to provide an intermittent sound and light signal to the driver when starting a car with the hand brake on. Its connection diagram is shown using the Moskvich-2140 car as an example, but can be done on other car models.
The device, the circuit of which is shown in the figure, consists of a sound generator assembled on transistors VT1, VT2, a multivibrator on transistors VT3, VT4 (relay winding K.1 is connected to the collector circuit VT3); additional switch SB2 and standard elements of electrical equipment - ignition key SA1, hydraulic brake tightness sensor SP, switch SB1 of the handbrake warning lamp and warning lamp HL.
- Switch SB2 is installed under the clutch pedal, similar to the brake light switch on the foot brake pedal. When you press the clutch pedal, the contacts of switch SB2 close, and when released, they open.
- The device works as follows. When the ignition switch SA1 is turned on, the +12 V supply voltage is supplied to the HL lamp and terminal 5 of the device. By closing the contacts of switch SB1 (handbrake is on), the multivibrator and signal lamp are connected to the negative power bus via the circuit: minus 12 V, closed contacts of switch SB1, terminal 4 of the device, normally closed contacts K1.1, switch SB2 and through diode VD1 to lamp HL . The multivibrator starts working.
- Turning on with a frequency of 1...2 Hz, relay K1, with its normally closed contact K1.1, switches the power supply circuit of the lamp, and when the contacts of switch SB2 are closed (the clutch pedal is pressed), it also switches the power supply circuit of the sound generator.
- When the SP switch is triggered (the seal of the hydraulic drive is broken), the warning lamp will emit a constant light as usual with this malfunction. The indication of the engaged state of the handbrake when the clutch pedal is pressed will be the same - an intermittent sound signal. This is achieved by separating the circuit of the SP switch and the negative power bus of the device with a counter-connected diode VD1, i.e. minus 12 V can be supplied to the device only through terminal 4 and closing the contacts of the SP switch does not affect the operation of the device.
In table Figure 1 shows the states of the indicators when the driver operates the handbrake (switch SB1) and the clutch pedal (switch SB2) when starting and driving the car with normal and broken hydraulic brake seals.
The device is connected by terminals 1, 2 to the clutch pedal switch SB2, by terminal 3 to the contact of the SP switch freed from the conductor (a) (see Fig. 2). The disconnected conductor(s) of switch SB1 is connected to terminal 4, terminal 5 to the +12 V power bus.