This circuit was found in a 1975 documentation. The SCR can be of any type and in this case, we have the horn activation. The relay must be a 12 V type with high contact current.
This circuit with the PA7601 was found in a 1967 Philco-Ford documentation. The circuit has a pass...
This CMOS version of the force gauge was found in a 1983 publication. In the CMOS version, the...
Using the LM317 (or LM350), this circuit is based on precision regulatory components such as those...