Stereo balance indicator (CB8509E)

Found in a 90s Popular Electronics, this circuit uses a simple 9 V source. The power can be used from the circuit with which it works.

| Clique na imagem para ampliar |

Triangular Oscillator (CB15684E)
The integrated circuit 4136 consists of operational amplifiers of type 741 in the same enclosure and...
100 Hz High Pass Filter (CB14132E)
In the figure we have an active high pass filter of 100 Hz, suggested by National Semiconductor in its 1994...
Zener Coupling (CB4139E)
According to the consulted American publication of the 1980s, a zener diode can be used for DC...