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I’m building the EA trem kit that I got from mammoth. It’s my first build and I have a noob question. I have the pin out for the 2N5457 transistors for Q1 and Q3 and I understand which pin is S, D, G. But I’m not sure on the slots for the transistors on the PCB, which hole is which. Thanks for the help.
The silkscreen of the Q1 and Q3 transistors on the PCB are showing the correct orientation for the 2N5457. You should just mount them as shown. GUITARPCB does suggest the use of sockets for transistors and IC chips. They prevent heat damage and make replacement much easier if needed.
Thanks for the response
I’ve got an EA trem kit from mammoth. I am using this build doc from guitarpcb.com (https://guitarpcb.com/wp-content/uploads/2018/06/BD_EA-Tremelo-v3.pdf). The enclosure came pre-drilled with 6 holes on top for knobs, LED, switches:
The kit came with 3 standard LEDs, 1 bezel, 3 pots, 1 DPDT switch and 1 3PDT footswitch.
Based on the build doc, I’m a little confused. It came with the killswitch so I was planning on wiring it for the bypass buffer as diagrammed on page 3 of the build doc. But that uses a bi-colour LED, which the kit did not come with. I guess I’m planning on putting the blue LED in D2 and mounting that with the bezel in the lower right hole in the enclosure. The killswitch will go in the lower left hole, then the 3 pots above. I’ll put one of the standard LEDs on the board in D1. Will this work?
Our authorized USA Kit Dealer is PedalPartsandKits (see home page) which do take the additional measures to make sure that everything is done our way. Mammoth simply purchases boards at wholesale from me and makes kits. I get no commission etc.
That said I can see why they do not perhaps go out of their way to offer a Bi-Color LED in their kit. That is a guess of course as I do not really have much of a relationship with them. You can however use a standard on/off LED by not using the white pad which is to represent the “Off” color.
If you decide to purchase future kits I can highly recommend PedalPartsandKits since they not only provide everything needed per our build specs (including sockets) but also each and every enclosure can be ordered hand-drilled to be be a perfect fit to each of our boards. They cost a bit more but there is a lot more time and effort put into making each kit a perfect fit.
I hope that helps.
The EA trems are a staple build for me.
I have used Fabbed PCBs, strip board, etched my own, etc.
I cannot remember what is in the one below, but it wasn’t fabbed. I was etching a lot those days. Basically until Barry assembled the dream team and what I want to build is usually more complicated than I care to etch.
https://wikipedals.com/videos/mNlfNIa4JeI/wilbur-enterprises-ea-tremolo
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