gunsmoker
New Member
I found this schematic floating around the net and built it for use as a doorbell. My wife and I like it very much but it would be nice if it were a tad louder.
**broken link removed**
I tried using an lm386 op amp on the output of this following a schematic provided in it's datasheet, also I tried using an identical transformer hooked up backwards to the existing transformer and directed the output from that into the op amp circuit but that didn't work either, I only got a long downward spiraling tone, but I honestly am not sure I had the transformer hooked up right because of the center tap on the primary winding: where should it go? I tried several configurations with the transformer as well as without. It seems the extra circuitry is throwing off the amount of time required to charge and discharge the capacitors. It finally occured to me that maybe what I'm dealing with here is not an ordinary signal like from an mp3 player but something else. Any help would be greatly appreciated as I am still an infantile electronics newbie and my wife and I have become quite attached to this cute little circuit, the grandchildren and the nephews and nieces love it too.
**broken link removed**
I tried using an lm386 op amp on the output of this following a schematic provided in it's datasheet, also I tried using an identical transformer hooked up backwards to the existing transformer and directed the output from that into the op amp circuit but that didn't work either, I only got a long downward spiraling tone, but I honestly am not sure I had the transformer hooked up right because of the center tap on the primary winding: where should it go? I tried several configurations with the transformer as well as without. It seems the extra circuitry is throwing off the amount of time required to charge and discharge the capacitors. It finally occured to me that maybe what I'm dealing with here is not an ordinary signal like from an mp3 player but something else. Any help would be greatly appreciated as I am still an infantile electronics newbie and my wife and I have become quite attached to this cute little circuit, the grandchildren and the nephews and nieces love it too.