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JackLondon

DIY Effects

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Peavey F-800B Preamp:

I used the factory schematics and schematics from a talkbass-project to create my own pcb:

f800b_front.jpg.8b6110ff272211f347ca519ede90b02d.jpg

f800bopen.jpg.91517ecb0ff6bc354c1f072d63b95781.jpg

 

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12 hours ago, Passinwind said:

Just in, some two band Bass/Mid preamp boards from a new US small run circuit board prototype vendor, DK Red. The DK = DigiKey, one of our biggest parts suppliers. Quality looks good and the pricing is just slightly better than OSHpark's basic service, but with far fewer options and a four board minimum as opposed to OSHpark's three. Many of us are hoping that DigiKey will go the next step and integrate parts supply, modeling data, PCB footprints, bill of materials management, and assembly into a one stop shopping experience. I'm nearly certain that they are shooting for that, and sooner than later.

DK_Boards.jpg.d7b55f1c01b7da85be4a846db713b36e.jpg

I spent a lot of the time I worked at Farnell trying to convince them they needed to offer a prototype/small run service like that and was repeatedly rebuffed... Should have emailed my digikey contact... 

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10 hours ago, itu said:

That 120B looks neat!

What is that Xvive chip there? Are all others opamps?

It is an optocoupler for the limiter-section. 

Edited by disssa
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Simple gain stage/clean boost with variable gain via trim pot:

 

SimGain.JPG.a01782bd0f21414bdc66ceba30384e81.JPG

 

I've done a matching mix/blend board as well, both will go up on OSHpark soon as free shares.

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