This triac circuit was taken from an article in the July 1970 Radio Electronics magazine. Note the snubber formed by R5 and C3 for controlling inductive loads.
This receiver for listening to the TR-23 phone was manufactured in Japan in the 1960s. The circuit is...
The two previous circuits show the INA185 a current sensing amplifier in basic applications. This...
This small digital transmitter uses a 1 MHz crystal, or another nearby frequency, to produce a...