Transistorized Bragraph (CB7009E)

This circuit was found in 80's Popular Electronics. The components used are common and the number of indication channels (LEDs) can be changed.

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Operational Amplifiers Symmetric Power Supply 78xx and 79xx (CB15342E)
This source can supply currents up to 1 A. The circuit is from Motorola's 1993 Linear Interface ICs....
Transmitter Monitor (CB23890E)
The purpose of this receiver is to monitor the signal from a nearby transmitter. It was published in an...
Symmetrical power supply (CB21691E)
In the figure we have a symmetrical power supply stabilized by a zener diode. Transformer and...