9V regulated power supply circuit diagram
Create 9V regulated power supply circuit using 7809 and transistor. For circuit requires stable voltage, low noise signal, and without AC voltage leakage.
TIP31
High power siren circuit using CD40106 and TIP31, small and easy
This is High power siren circuit with small PCB size, using CD40106 and four transistor TIP31-TIP32 increase current to horn speaker 20W, 4-8ohm. , and