This two-digit circuit was found in the 1999 Radio Experimenter Handbook. It uses the CA3161 and CA3162 A/D converter pair common at the time.
This circuit can be used as a shield for transmitting the temperature of a sensor. The circuit is from...
We found this circuit in an old manual. The bypass range is 20 MHz and the power supply must be...
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...