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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Current Monitor (CB15826E)
This circuit, suggested by National Semiconductor, provides an output voltage proportional to the...
Photodiode Amplifier III (CB1302E)
Found in 1980s documentation, this amplifier uses a symmetric source and the gain is given by the...
Visible light transmitter (CB7852E)
This modulated light transmitter was found in a 90s Popular Electronics. In place of the lamp with...