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Guitar Preamps and Buffer AmpsGPA-2 and GPX-2 preamps.
GPA2-GPX2-02T (15K)
While hosting the Java Café and Fox & Goose open mic's, I frequently had a problem with guitars and mandolins that didn't put out enough signal when they were plugged into my PA system. Acoustic guitars with Dean Markley pickups are almost always a problem. Well, I don't have that problem anymore. I have designed and built several different guitar preamps and buffer amps that I use at my shows now. I had three different preamp models with me last night (11/29/04) at the Java Café open mic and used them with a dozen different guitars and a mandolin and never had a level problem all night. And Yes, they all Sounded good too. No more of that tinky sound. I built one for Ken Burnett and one for Craig Kincaid, here's what they say about it:
When I bought a new Weber mandolin a few months ago I installed a top of the line pickup in it hoping that would solve all of my amplification problems. I play a lot of music with many full bands, and amplification of my instrument has always been a problem. With the addition of Dave Baldwin's fine pre-amp system I have finally found the most natural sounding and versatile addition to my top-line instrument. I couldn't be happier with the results. My sound is as good as it is when I just play into a microphone, and so much easier to control my sound when I have to play loud in any situation.
Ken Burnett
   After getting my GPA-2 preamp from Dave, the sound of my Martin D18 has never been better. And what's even more impressive is in the studio. When I plug directly into the board, the sound of the guitar is so nice; don't need much gain on the input to get the nice sound either. When I use an amp, it's the same. Such a warm and full sound. Thanks Dave for creating this great pre amp.
Craig Kincaid, Singer/Songwriter

GBA, GPA, and GPX series
These buffers and preamps use all discrete components and class A circuits.
GBA/X Series GPA Series GPX Series
Primarily for electric guitars with adequate signal. The GBA/X series is basically a unity gain high to low impedance converter. GBA's preserve the signal and tone while driving long cables and accessories. GBA uses one 9-volt battery and fits in your pocket. GBX uses two 9-volt batteries for greater headroom. Intended for acoustic guitars with add-on pickups. The GPA series has a 4.7 MegOhm input impedance and a gain of 10 dB. It uses one 9-volt battery and will fit in your pocket or on a belt clip. Maximum output level is about 1 Vrms. With it's eXtended dynamic range, the GPX series is a good preamp for connecting guitars to PA system line inputs. The GPX series has a 4.7 MegOhm input impedance and a gain of 10 dB. It uses Two 9-volt batteries for extended dynamic range with a maximum output level of 3 Vrms. The GPX+2 version adds an AC adaptor.
GBA-1- price not set yet.
GBX-1- price not set yet.
GPA-2 - $44 GPX-2 - $55
GPX+2 - $66 with 12 VAC power adapter

Dave Baldwin is DIBs Electronic Design, providing design support for Audio, Analog, Digital, and Microprocessor systems.
Contact Dave at DIBs Electronic Design   Dave's PDF Business Card