Jman 31
Member level 2
Hi Guys,
I am having a problem with this circuit that I designed. It uses a piezo to trigger a 555 timer and flash an LED. I added the amp section to get better sensitivity. When I use two separate power supplies for the amp and trigger sections it works perfectly, but as soon as I try to combine them to one power supply the LED's stay on indefinitely.
By the way, I am using the piezo right now so disregard the electret mic comments on the schematic.
Any comments or suggestions would be greatly appreciated.
Regards,
J
**broken link removed**
I am having a problem with this circuit that I designed. It uses a piezo to trigger a 555 timer and flash an LED. I added the amp section to get better sensitivity. When I use two separate power supplies for the amp and trigger sections it works perfectly, but as soon as I try to combine them to one power supply the LED's stay on indefinitely.
By the way, I am using the piezo right now so disregard the electret mic comments on the schematic.
Any comments or suggestions would be greatly appreciated.
Regards,
J
**broken link removed**