Bench thermometer (CB20501E)

With an ultra-low consumption, this circuit can be powered by solar cells. The circuit is from a 1991 documentation.

Digital Photometer (CB4327E)
This one-digit photometer using CMOS circuits was found in a 1989 documentation. The circuit is...
1 to 2 W Amplifier (CB4760E)
We found this circuit in an old Radio Electronics. Components can be replaced by modern...
RIAA Preamplifier II (CB938E)
This circuit makes the RIAA equalization for signals obtained from a turntable for signal recovery in other...