This circuit uses the SQ3524, a switching integrated circuit. The circuit was found in the April 1991 issue of Radio Electronics magazine.
The values of R1, R2, R3 and C1 depend on the signal to be integrated. The circuit is from Radio...
The output power of this amplifier depends on the supply voltage that can be between 3 and 16 V....
This polarity test or indicator indicates the polarity of a power line by LEDs. The circuit is...