3-tube reflex receiver (T1566E)

Found in a 1924 book by Gernsback, this receiver is wired into headphones. Note the high number of coils and supply voltages.

1 W Amplifier with the TAA300 (CB6164E)
Found in a 1968 documentation, this small amplifier was very popular at the time being used in...
TDA2002 Amplifier (CB420E)
When powered by a 14 V supply this circuit source 5,2 W to a 4 ohm load. For a 2 ohm load this...
TTL Logic Probe (CB5913E)
This circuit uses a 7-segment display to indicate the logic level of a test circuit. The power...