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Practical-current-limiting-coil-driver – Circuit Schematic
Practical-current-limiting-coil-driver
The p-channel devices are switched off by current sensors when the coil current reaches 10 A. The operation is similar to that of a switching-type power supply...
Zero crossing switch – Circuit Schematic
Zero crossing switch
When switching loads with the aid of a thyristor, a large amount of RFI can be generated unless some form of zero crossing switch is used. The circuit shows a s...
On-off controller – Circuit Schematic
On-off controller
The ac line-operated on/off controller is a simple, reliable solid-state alternative to a motive driven cam switch. Time 1 and time 2 are programmed by diodes t...
Triac zero voltage switching – Circuit Schematic
Triac zero voltage switching
The triac will be gated on at the start of the positive half cycle by current flow through the 3 µf capacitor as long as the C103 SCR is off. The load voltag...
High frequency switch – Circuit Schematic
High frequency switch
The 2N4391 provides a low ON resistance of 30 ohm and a high OFF impedance (< 0 pF) when off...
High frequency analog switch – Circuit Schematic
High frequency analog switch
Commutator circuit provides low impedance gate drive to the PN4091 analog switch for both on and off drive conditions...
Switching regulator operating at 200Khz – Circuit Schematic
Switching regulator operating at 200Khz
This circuit provides a regulated dc with less than 100 mV of ripple for microprocessor applications. Necessary operating voltages are taken from the bleeder re...
Laser diode pulser – Circuit Schematic
Laser diode pulser
This drive is capable of driving the laser diode with 10 ampere, 20 ns pulses. For a 0% duty cycle, the repetition rate will be 50 kHz. A complementary emitter-...
Complementary AC power switching – Circuit Schematic
Complementary AC power switching
An input signal of less than 1 mA and 1V is required to switch on CS1. As long as this input -signal is maintained, CS1 will conduct during each positive half c...
Full-wave scr control – Circuit Schematic
Full-wave scr control
This circuit enables a single SCR to provide fullwave control of resistive loads. Resistor R3 should be chosen so that when potentiometer R2 is at its minimum s...
High power control for sensitive contacts – Circuit Schematic
High power control for sensitive contacts
Two simple arrangementsfor resistive loads are shown in A & B. The circuit in A will provide load power when the actuating contact is closed, and no power when ...
Light isolated solid state power relay circuits – Circuit Schematic
Light isolated solid state power relay circuits
Both circuits use the GE. SC146B, 200 V, 10 A Triac as load current contacts. These triacs are triggered by normal SBS (2N4992) trigger circuits, which are cont...
Low voltage flasher – Circuit Schematic
Low voltage flasher
Applying voltage to the circuit triggers SCR1. With SCRl on, the voltage on the anode of SCR2 rises until SCR2 triggers to commu-tate SCRl. The voltage on the g...
High-speed laser diode driver – Circuit Schematic
High-speed laser diode driver
A faster driver can supply higher peak gate current to switch the VN64GA very quickly...
Driver circuits – Circuit Schematic
Driver circuits
CMOS drivers for relays, lamps, speakers, etc, offers extremely low standby power. At Vcc = 15 V, power dissipation per package is typically 750 nW when the out...
Cmos touch switch – Circuit Schematic
Cmos touch switch
This touch switch does not rely on mains hum for switching-It-can be used with battery powered circuits. Schmitt trigger IC1 forms a 100 kHz oscillator and IC2a...
Low current touch switch – Circuit Schematic
Low current touch switch
Touching the on contacts with a finger brings pin 3 high, turning on the Darlington pair and supplying power to the load (transistor radio etc)...
Touch-sensitive switch – Circuit Schematic
Touch-sensitive switch
A high impedance input is provided by Ql, a general purpose field effect transistor...
Auto touch switch – Circuit Schematic
Auto touch switch
When someone touches the touchplate (TP), the resistance of his finger across points A and is added in series to the combination of Rl and R2, the capacitor C2 ...
Touch on-off switch – Circuit Schematic
Touch on-off switch
A Touch On/Off Switch is desired, this circuit fills the bill. Two sensitive gate SCRs are interconnected, so that when one of the devices is turned on, the oth...