Found in Radio Electronics from the 90s, this thermometer uses an integrated circuit that is unusual today. The sensor is a thermistor or NTC.
This circuit is from an October 1963 Radio Electroncs. It uses a single 2N18383 transistor and a...
This circuit has a gain of 34 dB and a good power to be used as an audio booster in cars. The...
A flash of light directed at the LDR causes the SCR to fire and the motor to be activated in the...