jaylow
Rookie Solder Flinger
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Post by jaylow on Nov 30, 2010 4:13:38 GMT -5
Hello Everyone! This is my first post.
I saw a post here about adding a piezo pickup to a strat and it inspired me to do the same to my own strat. After some reading and research, I realize that I need to add a preamp in order to get an appropriate sound from it. Don Tillman's preamp seems to be the popular choice for a preamp.
I'd like to be able to control the volume at the same time. How can I go about altering the schematic so that I can get volume control? Is it possible to add a volume pot between the piezo and preamp and if so, what value pot should I use? Or is there something I can do to the preamp so that I can adjust the volume?
I look forward to hearing your responses. Thanks for the help everyone!
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Post by newey on Nov 30, 2010 8:42:45 GMT -5
jaylow-
Hello and Welcome to G-Nutz 2!
The post you reference was JohnH's, using a cheap piezo buzzer element to convert a Strat. And now I can't seem to find that post to link to it.
But as I recall, John provided a diagram of the buffer circuit he used, and I thought it had a volume control on it.
I don't think adding a passive volume control before the buffer is the best solution. Probably better to add one to the buffer circuit itself.
If you can post a link to Tillman's circuit, we can evaluate adding a volume pot to it. I'm sure it can be easily incorporated.
JohnH hissownself will no doubt chime in as well.
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Post by newey on Nov 30, 2010 8:57:45 GMT -5
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jaylow
Rookie Solder Flinger
Posts: 13
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Post by jaylow on Nov 30, 2010 11:52:37 GMT -5
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Post by JohnH on Nov 30, 2010 13:53:01 GMT -5
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jaylow
Rookie Solder Flinger
Posts: 13
Likes: 0
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Post by jaylow on Nov 30, 2010 20:23:39 GMT -5
Just to confirm, that last circuit on your thread there would be a suitable starting point me to use?
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Post by JohnH on Nov 30, 2010 21:27:44 GMT -5
yes its a good basis for a gain stage. It will drive a guitar amp or most line inputs. maybe change the output cap from 330nF up to say, 2.2uF to get max low end if you are driving a line input. Also, omit C6 to get about x3 gain, or add it in to get significantly more gain.
I suggest starting however, by mounting your piezo, plug it directly into a guitar amp input or non-tru bypass stomp box and find out how it sounds. The tone and level that you get will inform the right preamp design.
J
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