门铃电路图-BirdieDoorbellRinger
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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.
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