Optical shield (CB20698E)

This circuit was found in American documentation from the 90s. The coupler is the type that uses a photo-Darlington.

12.5 W Amplifier (CB13212E)
The components of this circuit from the 70's are no longer common on the market, but it is...
Function generator 741 (CB10135E)
This circuit produces rectangular and triangular signals using two 741 operational. The source must...
Audio peak indicator (CB21972E)
The basis of this 90s circuit is a CA3130 operational amplifier. The circuit does not need a...