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Building your own stompbox / Re: Securing a breadboard inside the pedal?
« Last post by antonis on Today at 09:42:32 AM »
but not that good for repair

IMHO, both epoxy heat transfer ability (greater than air) and oxygen-sealed encapsulation minimize components failure possibility..
Each BJT bias point can be individualy trimmed via its particular leakage and bias resistor value.. :icon_wink:
(no more no less)
Thanks for chiming in!

It seems from the time I've spent researching, that I am able to get myself into the ballpark on transistor voltages that I have seen others mention in terms of "target values". Q2 voltage does go up to around -9v with attack on minimum. It's seemingly functioning as it should! But it's almost as if I'm compensating between positions to hit target voltages while falling outside of the suggested gain/leakage values for one or more of my gain stages with every combo tried thus far.

Just for clarification, it seems for Q2, the target collector voltage with attack on full should be somewhere slightly above half of the supply voltage. Would you agree something like -4.5-5.5 volts is the target here?

I consistently see people suggesting Q3 collector voltage should be around -8 to -8.75 volts with attack at max. The more leakage in Q3, the lower I observe this voltage to be when measuring. I seem to observe more idle noise and "whistling" when Q3 is higher leakage. Tuning this circuit is like walking on a tight rope!

I am inclined to agree, I simply don't have the ability to come up with the proper combo with my available stash of components, hence why I have decided to buy some more transistors to add to my collection.

I have ordered some more transistors over the weekend. For kicks, I ordered one of the MKI sets from SmallBear. Really curious how that will work out. Also ordered some pretty sweet RCA 2N414 and some Russian MP42B trannies from eBay (we shall see how that works out).

I'll be getting my order from SmallBear this evening so I will be sure to report back with my findings!
Some people use cast potting material to encapsulate a circuit board.  This makes it easy to mount and it is insulated but not that good for repair:

Building your own stompbox / Re: Securing a breadboard inside the pedal?
« Last post by Phend on Today at 07:20:56 AM »
After searching lo and hi I found what I wanted.
A solderable breadboard.
There are different sizes.
You can take a breadboard project and direct transfer it for soldering.
I downloaded the Hammond 1590B stp file so as to make a solid model assembly.
And locate all the components,  switch, pots, board, jacks.....
There are jumper wires on the back, these isolate.
But nylon standoffs are an option.
I believe solder is for points, not lines.
Problem, you aren't going to build a large circuit on that small board !

I have taken a few electromagnetic compatibility courses ( the Don White courses are excellent and thankfully they were funded by the company I was at) and one thing they say is the best way to eliminate noise is to not generate it in the first place.  A power kill switch always going to be the most effective answer.
I build on perf almost exclusively.  I used to use standoffs (attached to the enclosure's inside with JB Weld), but now I just put some non conductive padding in there and let it be as in "Ben's #4" above.   Never have any problems - the wiring is firm enough to keep it from moving around.  Just have to be sure there's no way to short the board out on the enclosure.

If it was something really involved and precious, I might consider doing the standoffs again for a neater, 'more complete' build.
I'm not sure if we're talking about this:, with no further mods, but power supply LPF (R13/C9/C10/C11) of 530Hz corner fequency can't be effective..  :icon_wink:
Building your own stompbox / Re: Securing a breadboard inside the pedal?
« Last post by Ben N on Today at 05:09:34 AM »
Yes, indeed, welcome! And best of luck with this projects and all those to come, which we look forward to hearing about & helping with, if you need any help.

Point of terminology: Around here, when folks speak of a "breadboard", they generally mean the solderless variety, like this:
. They are the nuts for test-building, trying out and tweaking circuits.

The soldered kinds of prototyping boards, such as

are generally referred to as perfboard (or "pad-per-hole"), stripboard (or "vero"), or protoboard.
Although you aren't wrong, these can be "breadboards", too. Then again, so can this:
Lantertronics - Aaron Lanterman youtube is great, but he's a professor and it's heavy on maths. He does enjoy musical electronics and has plenty of videos on them and also basic circuits and the math for them. You probably won't get a whole lot out of them without known what Thevenin theorem equivelents are and similar things as he uses that stuff quite a lot to explain things.

Aaron's stuff is a bit advanced and uses a lot of mathematical analysis so may not be suitable for real beginners but I agree that his video tutorials are some of the best out there.
He is a very approachable and friendly guy, highly respected by all of his students and peers. I often have an online chat with him discussing some of his videos and and have assisted him in some of his research and analysis of old pedal circuit designs in the past.

Aaron's Youtube channel is one of the sites that I recommend in the document that I posted a link to above.

Another excellent resource is the Gitec Forum:
This is a great book written by another university professor with a passion for music and music technology.

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