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Old 21st February 2013, 02:36 PM   #11
xstreme is offline xstreme  Europe
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Quote:
Originally Posted by argonrepublic View Post
I have decided to try to go the expresspcb route. I am however encountering difficulty with objects. Mostly with the ICs. This is a schematic of a DIY Oscillator

Fahey in this posted diagram i would try to mix/sum the output of u7d and u6c...
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Old 21st February 2013, 03:23 PM   #12
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Designing a PCB is not simple, but it's not rocket science either.
4"x3" is pretty small.
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Old 21st February 2013, 11:03 PM   #13
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Ther problem was in the transistors symbols. Following some time spent staring at it, I concluded that a pair of tranistors symbols represented an OPA2137, I am guessing from this point that U7a, b, c and d are a combination of transistors that make up the TL074. The source of oscillation is thr transistor pair which is an LM394. I could be wrong, I have never attempted a project like this.
I have a .pdf that I could print and etch. I have never etched a board either. I don't have the equipment on hand and felt that I could become active by redoing the schematic while learning the software. When and IF I am successful, I could upload and get pcbs. Either direction is going to require some effort and possible loss.
The circuit is a Voltage controlled oscillator for modular synthesizer.
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