12V x 10A power supply (CB21775E)

This power supply is from a 1977 documentation. The transformers have 11 V secondary with 10 A.

Transistor Amplifier (CB18905E)
This excellent circuit came out in a Japanese publication from 1971. It uses Japanese transistors of the...
Temperature to frequency converter (CB5103E)
This circuit is from the owner's manual of the integrated circuits used. The manual is old, which...
Hall sensor compass (CB22345E)
We found this circuit in an English documentation from 1995. The Hall sensor used is from the time...