The sensors in this circuit that triggers when the temperature goes out of a certain range are common diodes. The circuit is from the 1991 Reista Electronics Experimenter's Handbook.
This is the decoder circuit for the previous encoder (CB17011E) using integrated circuit MC14028. This...
This circuit activates a relay when the sensor receives light indicating dawn. A relay with a 4k7...
This old radio with a germanium transistor was obtained from an English documentation from the...