tape player amplifier (CB7301E)

Found in a 1968 Electronics World, this circuit uses operational amplifiers from that time.

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MW Transmitter (CB16424E)
This small transmitter for the medium wave range (MW) was found in a 1980 publication. Its signals...
Heart Monitor (CB24587E)
This interesting circuit was presented in an article in Radio Electronics magazine in July 1979....
12 V to 110V or 220V Inverter (CB16837E)
This inverter can reach a power of 300 W depending on the transformer used. In this case, a...