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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10W Non-Inverting Amplifier LM18675 (CB25524E)
Unlike the previous circuit, which is an inverter type, this one is non-inverting. The circuit...
Sine and Cosine Oscillator with the 741 IC (CB9513E)
This circuit generates sinusoidal and cosine signals of 2 kHz given basically by the values of C1...
High Voltage Power Supply for Photocells (CB12891E)
This circuit is from an Argentine publication from 1973. It provides a signal to an amplifier from...