This circuit from a 1966 General Electric manual makes use of an SCS. The time is given by the emitter capacitors of the unijunction transistor.
This sensitive circuit was found in a Texas Instruments optoelectronics manual. The transistors can be...
The circuit shown is from the Motorola Linear Databook of 1990. It is based on the Motorola T...
This circuit uses an operational amplifier that is still common today. The indication is made by...