Hey all, need a little help.
Trying to build a small amp (see attachment)
Basically i want to build a box i stomp on, with a piezo transducer in it
i want out the big bass thump sound similar to a bass drum
output from the (small) amp will be to my gig setup amp.
Any help would be madly appreciated...
i have built this circuit on the breadboard it works well with a small speaker but when i plug it into my peavy 100w amp i get really bad humm.
once again any help will be madly appreciated.
Thanks
Trying to build a small amp (see attachment)
Basically i want to build a box i stomp on, with a piezo transducer in it
i want out the big bass thump sound similar to a bass drum
output from the (small) amp will be to my gig setup amp.
Any help would be madly appreciated...
i have built this circuit on the breadboard it works well with a small speaker but when i plug it into my peavy 100w amp i get really bad humm.
once again any help will be madly appreciated.
Thanks
Attachments
Ground loop maybe How are you powering the stomp box? from a wall-wart?
Try on battery power first, if its quiet then look to the power unit. This can a problem when connected to the Peavy as thats grounded as well as the power supply. In this case running on the internal speaker it will not hum.
For a mains power supply try a regulator (7809?) and some caps to tame the hum. Good luck
Try on battery power first, if its quiet then look to the power unit. This can a problem when connected to the Peavy as thats grounded as well as the power supply. In this case running on the internal speaker it will not hum.
For a mains power supply try a regulator (7809?) and some caps to tame the hum. Good luck
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PIE20 is that the pizo device? Have you got one? Where can we see data on it? Do you want to be able to change the tone? or just the same all of the time?
Lol, Sorry for my poor writing skillz, it does say Piezo..
Andrew, Yes i am trying to generate a sound similar to a bass drum from the box.
the piezo and the "little amp" will be mounted in the box, output via 6.5mm mono to my 110 watt amp.
Firechief. Yes i have 3, 45mm piezo discs $5 from eBay. Not sure on the specs. perhaps would be advantageous to change the sound, maybe even get some sort of resonance / reverb if this is possible (and not above the skill level of a beginner diy). suggestions?
Spiny. I have been powering it from a 9v pp3 battery, all ground lines shown on the schematic are linked to the - terminal of the battery ( i think this is my problem as there is no "actual earth" basically i get an ok sound, but i get some "MAD" humm even at low volume levels.
out of interest i have also been trying to duplicate a similar device from a TL072 opamp with no success.
Andrew, Yes i am trying to generate a sound similar to a bass drum from the box.
the piezo and the "little amp" will be mounted in the box, output via 6.5mm mono to my 110 watt amp.
Firechief. Yes i have 3, 45mm piezo discs $5 from eBay. Not sure on the specs. perhaps would be advantageous to change the sound, maybe even get some sort of resonance / reverb if this is possible (and not above the skill level of a beginner diy). suggestions?
Spiny. I have been powering it from a 9v pp3 battery, all ground lines shown on the schematic are linked to the - terminal of the battery ( i think this is my problem as there is no "actual earth" basically i get an ok sound, but i get some "MAD" humm even at low volume levels.
out of interest i have also been trying to duplicate a similar device from a TL072 opamp with no success.
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