The purpose of this circuit is only to increase the input resistance of a multimeter, since there is no voltage gain. The batteries are 9 V and operational equivalents can be used.
This circuit is intended to trigger a TTL door or flip-flip from a signal coming from an SCR....
This circuit is from a 1979 publication. The sensor consists of plates or screens that, when...
Bipolar transistors are types of general use like BC548, while the power MOSFET can be of any type...