Switch off delay circuit by 2N4871
Controls & Timers
This circuit prevents surges. From the opening is switched off or power failure. The damage to electrical appliances. The circuit will switch to use a short period before Power raising circuit to go. When raising the power supply 9-volt circuit then. Circuit delay. The duration of charging C1. VR1 is adjusted with time.When C1 is fully charged, it will be pressure to bias the pin G of the FET 2N4891 . Q1 to conduct work to trigger to pin G of the SCR to run.When SCR relay will work to cut the flow circuit to work. If you want to …