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 simple demonstration circuit was found in a Popular Electronics of the 1980s. It can be...
This circuit is from the 1982 SGS Linear Circuits Manual. The circuit provides currents from 35 mA...
This is a high side smart current monitor circuit. The circuit is from a 2005 Linear Technology...