Radio with amplifier (CB20486E)

We found this circuit in a publication of 1991. The audio amplifier is an operational that admits equivalent.

2-Transistor Mini Radio (CB16308E)2-Transistor Mini Radio (CB16308E)
To receive the medium wave stations in your locality, we have here a receiver that, despite its...
Photo Oscillator (CB512)
The frequency of the tone produced by this oscillator depends on the amount of light falling onto...
0 to 9 V x 100 mA power supply (CB11956E)
This small unregulated power supply can supply voltages from 0 to approximately 9 V under a...