SCR SLAVE FLASH
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Dc static switch
This circuit is a static SCR switch designed for use in a DC circuit. When a low-power signal is applied to the gate of SCR1, this SCR is triggered, allowing voltage to be applied to the load. The right plate...
Strobe-tone burst generator
With a dual supply voltage, the external capacitor on pin 10 can be connected to ground to stop the oscillation of the 8038. The circuit employs a FET switch and a diode, which are combined with an input strobe signal...
Add-on-telephone-hold-button
A sensitive-gate SCR provides a line-holding current of 20 to 40 mA, depending on loop resistance. It also lights an LED to give the user a positive indication that the telephone line is on hold. The 20 to 40 mA...
Safe bedside lamp lighting switch
Closing the switch S allows the SCR to be triggered through resistors R1 and R2, which results in the lamp being powered by full-wave AC voltage. When the switch S is opened, the gate trigger current is lost, and the...
Flash slave driver
In photography, a separate flash, triggered by the light of a master flash, is often required to provide additional light and fill in shadows. The sensitivity of this circuit depends on the proximity of the master flash and the value...
Flash Slave Trigger
Flash slaves are used when you need to supplement one flash unit with one or several more. This slave trigger simply triggers those other units. It does this by "seeing" the first flash (using a phototransistor) and triggering the other...
Code-practice-oscillator
Capacitor C1 charges through resistor R1, and when the gate level established by potentiometer R2 is sufficiently high, the SCR is triggered. Current flows through the SCR and earphones, discharging C1. The anode voltage and current drop to a low...
Plug-in speed control for tools or appliances
Most standard household appliances and portable hand tools can be adapted for variable-speed operation using a simple half-wave SCR phase control. This device can serve as the speed control unit for typical loads, provided they utilize series universal (brush type)...
SCR Protection Circuits
Silicon Controlled Rectifiers (SCRs) are sensitive to high voltage, over-current, and transients. To ensure satisfactory and reliable operation, they must be protected against such abnormal operating conditions. Due to the complexity and cost of protection mechanisms, devices with ratings higher...