I'm trying to make a Visual Metronome, i have a prebuilt one already (bicycle light) but it has a very high frequency of lighting up (2 flashes in 1 second).
I have a circuit for metronome, to which i added an LED, alongside the speaker, and it works fine, both the sound and light work as expected, giving 60 BPM output. (with change in C from 22 uf to 10 uf)
Orignal Metronome Circuit:
Visual and Sound Metronome, by Adding an LED:
Now, i am trying to make just a visual metronome from this, without the sound... That is, only with a blinking light, at 60 Blinks per minute...
The problem i am facing is that, if i remove the piezo speaker, i get a constant glow of LED, or get a blink in many minutes, and it only starts to blink correctly when i add the speaker back. I have tried adding a resistor across the LED, but that did not help.
I did see this question on EE, SE, and tried the circuit suggested by Jasen, but it didn't work for me... ( 3V LED Pulse Circuit )
So, i am wondering what alteration i need to make to the circuit, for the LED to blink, without the speaker added, to make it just a Visual Metronome, maybe with a couple of LEDs at a later stage.
This does not blink or blinks in minutes:
I do not have simulation experience, so i am unable to troubleshoot this with a program.