Broadband amplifier (CB9179E)

Found in an old Popular Electronics, this circuit has a gain of 20 dB. The integrated circuit is uncommon today.

13.8 V x 5 A Power Supply (CB1216E)
This source was found in a 1982 American publication, but can be easily assembled using 2N2995 (PNP...
W Transistor Amplifier - TIP31 (CB11566E)
This is a very traditional configuration of an audio amplifier with 12 V power supply, providing a 1.5 W...
13 V power supply uA723 (CB19021E)
Although newer voltage regulator integrated circuits exist, the uA723 is still very common in...