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Old Dec 22, 2007, 7:23 PM   #1
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How to make aPreamp, made simple.

1st learn the baiscs of soldering click me you'll practice on an old board that simple

2nd when ready have the basic items needed, for a preamp click me

Kit contains for 2 preamps,

270-090 - PC Board Condenser Microphone element $3
272-997
- 2.2mf Electrolytic Capacitor, 50v (anything 9v or higher is fine) $2
271-309
- Assorted Metal Film Resistors, pkg of 50 (you just need one 10kohm)$3
276-148
- General Purpose Dual PC Board $3
275-409
- SPDT Submini Slide Switch, or equivalent $3
274-246
- 1/8" Stereo Phone jack (bridge the tip and ring together) $3
plus a
9volt battery and a 9volt battery connector w/pigtail. $5-6





Step one In Pic one you have your parts laid out it is that simple plan it in advance, draw it on the paper and board , or Choose no. 4 it is so much easier to do.

Step two. you need to lay out the switch cap, and res, and mic you need to drill a hole , cut the board place all the parts in, cap andres goes either way no one way.

1 2


3 4



Step three you need to start somewhere. so start with center of the switch B1 is a battery (+) wire solder and connect a lead to S1. s2 is the resistor solder to top of switch. This will allow an on/off for the power. R2 loop it and that will end with the M1 for (+) of the Mic you completed your resistor. leave a longwire from the A 1 side that is the Aipteks mic(+), C1 is the capacetor make a wire ands older to C1 and at C2 connect to R2 youcompleted your capacetor.

A2 (-)is the aiptek mic leave a long wire.(-) B2 isa battery ground bring both to theM2

Solder all peices and you completed your preamp



Option B

Pic 4 twist cap and res together attach to a mic(+) res side goes to batt (+) cap goes to aip mic (+) mic(-) goes to groud of battery, and aip (-) mic. solder tape finished

You may want to do Option B super easy. I have succeeded wit hthe AV imput , as a Mic, I have not yet or will modify in the Aiptek. for those who wish to Please use caution, not responsable forany actions. hope this mod works out.
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Old Jun 23, 2008, 10:37 PM   #2
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Can you provide a diagram that adds a mic in (plus the new mic)? How should you wire the stereo mic in with its 5 leads? I would like to have the option of the mic in AND the new microphone. Thanks.
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Old Jun 24, 2008, 7:49 AM   #3
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welcome aboard.

I only followed a members advice wasvery hard to pull the info from hi or her?

there is a list or post c/p below for you from

http://forums.steves-digicams.com/fo...=92&page=3

I may attempt the repair, myself as well, but who knows if it will work . I would love a 30 foot distance ofa person saying testing

http://forums.steves-digicams.com/fo...mp;forum_id=92

http://www.vimeo.com/994164 using the mic


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Old Jun 24, 2008, 7:52 AM   #4
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So if you put those two together, it should work with the preamp? Does the switch only control power then?
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Old Jun 24, 2008, 8:08 AM   #5
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no. the one I made is not a power amp it only works 2 inchs from the mic. no more, it will filter no amplify.


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