Voltage-doubler
This circuit operates relays rated for 24V and 18V DC using a 12V power supply. It can be implemented with a wide range of PNP or NPN power transistors. Components include: U1: NE 555 timer; C1 and C2: 50 pF, 25 VDC capacitors; Q1: TIP29, TIP120, 2N4922, TIP61, TIP110, or 2N4921 transistors; Q2: TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918 transistors.
The described circuit is a relay driver that utilizes a 12V power supply to control relays operating at 24V and 18V DC. The core of the circuit is based on the NE 555 timer, which is configured in a monostable or astable mode depending on the desired operation. The NE 555 timer's output can be used to switch the power transistors, which in turn control the current flowing to the relay coils.
The inclusion of capacitors C1 and C2, rated at 50 pF and 25 VDC, serves to stabilize the circuit and filter any noise that may affect the performance of the timer and transistors. The choice of power transistors (Q1 and Q2) offers flexibility in terms of current handling and switching speed. The recommended transistors such as TIP29, TIP120, 2N4922, TIP61, TIP110, and 2N4921 for Q1, and TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918 for Q2, provide a range of options suitable for different applications and load requirements.
When implementing this circuit, it is important to ensure that the transistors are adequately rated for the relay coil current and that appropriate heat sinking is used if necessary. The circuit can be further enhanced with flyback diodes across the relay coils to protect the transistors from voltage spikes generated when the relays are de-energized. This design is versatile and can be adapted for various control applications, making it a valuable addition to any electronic project involving relay control.This circuit drives relays of 24 and 18 Vde from a 12-V power supply. Use this circuit with almost any pnp or npn power transistor. Parts: Ul: NE 555 timer. Cl and C2: 50 p.F/ 25 Vdc. Q1: TIP 29, TIP120, 2N4922, TIP61, T!PllO, or 2N4921. Q2: TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918. 🔗 External reference
The described circuit is a relay driver that utilizes a 12V power supply to control relays operating at 24V and 18V DC. The core of the circuit is based on the NE 555 timer, which is configured in a monostable or astable mode depending on the desired operation. The NE 555 timer's output can be used to switch the power transistors, which in turn control the current flowing to the relay coils.
The inclusion of capacitors C1 and C2, rated at 50 pF and 25 VDC, serves to stabilize the circuit and filter any noise that may affect the performance of the timer and transistors. The choice of power transistors (Q1 and Q2) offers flexibility in terms of current handling and switching speed. The recommended transistors such as TIP29, TIP120, 2N4922, TIP61, TIP110, and 2N4921 for Q1, and TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918 for Q2, provide a range of options suitable for different applications and load requirements.
When implementing this circuit, it is important to ensure that the transistors are adequately rated for the relay coil current and that appropriate heat sinking is used if necessary. The circuit can be further enhanced with flyback diodes across the relay coils to protect the transistors from voltage spikes generated when the relays are de-energized. This design is versatile and can be adapted for various control applications, making it a valuable addition to any electronic project involving relay control.This circuit drives relays of 24 and 18 Vde from a 12-V power supply. Use this circuit with almost any pnp or npn power transistor. Parts: Ul: NE 555 timer. Cl and C2: 50 p.F/ 25 Vdc. Q1: TIP 29, TIP120, 2N4922, TIP61, T!PllO, or 2N4921. Q2: TIP30, TIP125, 2N4919, TIP62, TIP115, or 2N4918. 🔗 External reference
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