This circuit generates control signals for stepper motors. We found it in a 90s Popular Electronics. The power can be made with a 5 V supply so that it works as a shield.
In the figures we have an infrared transmitter with a BC337 switching transistor that must be...
This circuit was obtained in Radio Electronics from the 90s. The integrated circuit is uncommon...
This circuit uses an improvised optical switch with a lamp and an LDR. The maximum power depends on...