Found in the 1969 neon lamp documentation, using neon lamps this circuit provides 18 V regulated with 0 to 4 mA current. The lamps are types of the time.
This 80's circuit turns off a TV or other appliance after a set time. The base is a 555 IC and the...
This circuit activates a relay when the conducting bars (probes) are held by a person. The circuit is...
This step of two transistors was found in an English documentation of 1965. The circuit can be...