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DIY Knock headphones for standalone tuning


ucw458
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man it's been a long time but do you mean transister and not 'chip'

you do not use two of the same voltage transisters ,you need to match the 2'd transister to the out put voltage your expecting so the input will be within it's range , any way some thing like that it's been 30 yrs sence i play'd with circirts

 

 

I'm using a LM324 op amp chip from radio shack.

 

http://www.radioshack.com/product/index.jsp?productId=2062592

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