Want to Ditch the Extension Cords in Your Generator Setup? Install a Manual Transfer Switch Instead.

Check each circuit by flipping the switch to the “off” position, then to the “gen” position. The lights or appliances on the ...
EDN

Use a 555 timer as a switch-mode power supply

Most switch-mode power supplies rely on a PWM (pulse-width-modulated) output that is controlled via voltage feedback. A 555-timer IC can inexpensively perform PWM. The circuit in Figure 1 shows how to ...