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wagiminator / ATtiny13-ContinuityTester

Simple Continuity Tester
https://oshwlab.com/wagiminator/attiny13-continuity-tester
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The buzzer may need an amplifier #1

Open sarins opened 2 years ago

sarins commented 2 years ago

I made this tiny device just now, I have replaced 1220 battery by rechargeable lion battery 3.7V, but the buzzer did not work, and the same time, I found the typical application circuit from manual of buzzer, I think the buzzer circuit missing a important part, which should be an amplifier, the ATTiny13 IO port can not supply enough current for the buzzer at all, so for following DIYer may need to caution for this issue.

wagiminator commented 2 years ago

Hi, it works fine for me. Such a small buzzer doesn't necessarily need an amplifier. Not only I have operated such a buzzer in numerous circuits directly via the pin of an AVR. All you have to do is ensure that an oscillating signal is applied (in this way you could even operate an LED without a series resistor). So the problem with you is probably somewhere else. Please check whether the clock frequency and the corresponding fuses are set correctly, as this affects the audio frequency output. Also try an external power supply to rule out a problem with the battery.

sarins commented 2 years ago

OK，Thank you so much, I will continue to check it out.