[1823] Mini-Booster Modules

Date: September 9th, 2015 | Comments : [4] | Categories: DIY.

Minibooster modules

Pre-assembled Mini-Boosters now available for purchase.

These are pc boards with all parts installed. No worries about hard-to-find jfets or other parts. Small enough to fit in a 1590A aluminum box. This is the classic mini-booster circuit and complete assembly instructions are sent to all purchasers of the modules. (Fairchild J201 transistors used on module.)


4 Responses to “Mini-Booster Modules”

[742959] Marcello Says: 7:05 am, October 1st, 2015

Gorgeus boost, I built when I bought ftom you the instructions years ago.
I think I’ll buy one of this smd unit to use it after my other ODs to kick the volume when needed.
Just a couple of question, I love the mild crunch it has but it’s a bit to spikey, that said, with the additional output buffer:
1. can I put a simple pot cap to ground before the pot volume to tame a bit the highs or could it load the output too much?
2. with C3 is it possibile to get more crunch or have I to work with the supply voltage with a couple of resistor as a partition?

thank you

[742977] admin Says: 8:35 am, October 1st, 2015

Thanks Marcello,

You can add a cap to ground before the volume pot but it might be a good idea to add some series resistance before the cap. I suggest 10k as a start. The volume control still is last in line.

If you add C3, you will get more gain and more crunch when powered by 9v.

These modules are made with genuine Fairchild J201 transistors that are high gain so they have a lot of boost available!

regards, Jack

[743024] Marcello Says: 12:28 pm, October 1st, 2015

Order placed.

with a 10K pot (10KA or 10KB?) what cap would you suggest for the tone control?

And, one more question (sorry), C3 was 10uF in the original design, but in that place I think it could influence the bass response too, so what about reducing the value to modify the low pass cut, would it work?

thank you
best regards

thank you

[743201] Marcello Says: 3:50 am, October 2nd, 2015

Ok, many thanks, got the infos!
I can’t wait to receive the module!
best regards


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