I have an old Russian clock, that you wind up every day, but has a AA battery for the alarm. It somehow creates sound and vibration by resonating a metal piece. However, recently this broke. And my idea is to replace it with a small Piezo buzzer and some kind of an oscillator. Since I'm not an expert in this part of electronics, I only have a basic model in my head:
- A capacitor charges to a voltage
- A transistor is saturated enough by this voltage to pull the cap to ground and discharge it
- Capacitor discharges and the whole cycle repeats
- Piezo is connected to the oscillating pin and ground.
Is this possible, or are there any other alternatives using common components only?