门铃电路图-Birdie Doorbell Ringer
门铃电路图-Birdie Doorbell Ringer:Notes:P1 is of experimental value. Start with 220ohms or so and modify to suit your needs。The transistor is a general purpose kind and is not criTIcal;almost any pnp type will work.
门铃电路图-Birdie Doorbell Ringer:Notes:P1 is of experimental value. Start with 220ohms or so and modify to suit your needs。The transistor is a general purpose kind and is not criTIcal;almost any pnp type will work.