BA500v2 Mic Pre Amp BUILD THREAD 500/51X

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Joe Malone
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BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Post by Joe Malone »

BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Under construction
Please feel free to ask for any extra info you need while building on this thread so I can add it here.

The BA500v2 is a 500/51x version of our well know Baby Animal mic pre.
Image

BA500v2 PCB build map
http://jlmaudio.com/builds/maps/BA500_map.html

GB500v2 PCB build map
http://jlmaudio.com/builds/maps/BA500_G ... n_map.html

FETDI500v2 PCB build map
http://jlmaudio.com/builds/maps/BA500_FETDI_map.html

If you are not 100% with resistor colour codes use a multimeter to check values as you place the resistors
Image

Chart of variable parts
RPAD Normally = 120R but can be made smaller in value for greater than 20dB PAD or larger for less than 20dB PAD
RZobel for JLM14 = 2k2 and Z pot 50k (front & back pot legs joined), for VTX = 10k and Z pot 100k (use back pot legs only)
CZbl can be not fitted or up to 390pF in value depending on the opamp used.
Ratio Pads not used for JLM14, For VTX fit 2 wire link linking pin 1-2 & 3-4.
Phase pads These are only needed/used if fitting API2622, JE-115 input transformer etc.

Click on images to enlarge
Toggles.jpg
Toggles 2.jpg
Toggles 3.jpg
Toggles 4.jpg
Toggles Meter & Pots.jpg
Cut Cable inchs.jpg
Cut Cable mm.jpg
Cut cables & solder.jpg
BA500v2 pot wiring colours.jpg
Pot wiring for JLM14.jpg
BA500v2 front detail.jpg
Toggle switch & LED detail.jpg
BA500v2 front angle.jpg
BA500v2 back angle.jpg
BA500v2 side.jpg
BA500v2 angle with DI fitted.jpeg
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Joe :-)
JLM Audio
Capturing Audio without Injury

kellyad33
Posts: 1
Joined: Sun Nov 28, 2021 2:27 pm

Re: BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Post by kellyad33 »

Just building this BA500v2 now and didn't realise there wasn't a complete build thread for this version.
The build maps are great, and the base build seemed simple and complete.

But I wasn't sure with some of the Go Between Build Map ...What do I do when I get to:
CZbl See chart
Ratio See chart
Phase pads See chart
What chart is it talking about?

Also it doesn't seem clear on the wiring for the assembly. I've tried to make it out from the assembled pics but can't quite see.

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Joe Malone
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Posts: 1796
Joined: Wed Jan 24, 2007 11:35 pm
Location: Brisbane, Australia
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Re: BA500v2 Mic Pre Amp BUILD THREAD 500/51X

Post by Joe Malone »

kellyad33 wrote:
Mon Nov 29, 2021 12:00 pm
Just building this BA500v2 now and didn't realise there wasn't a complete build thread for this version.
The build maps are great, and the base build seemed simple and complete.

But I wasn't sure with some of the Go Between Build Map ...What do I do when I get to:
CZbl See chart
Ratio See chart
Phase pads See chart
What chart is it talking about?

Also it doesn't seem clear on the wiring for the assembly. I've tried to make it out from the assembled pics but can't quite see.
Reload this page to see the updated page and let me know if you need any more info. Chart info is just under the multimeter image
Joe :-)
JLM Audio
Capturing Audio without Injury

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