This circuit was found in a 1966 General Electric book. The triac and the day are from that time and can be replaced by modern equivalents depending on the load.
This two-phase stepper motor circuit was found in an old documentation using an operational amplifier...
This circuit is from an American 80's documentation. The transistor is general purpose,...
As in the previous circuit (CB4052E), the relationship of values between the feedback and input...