watt, volt, degrees, preset, linear, log??????? WHAT????

[gcme93]

I find the easiest (and quickest) way to put images on here is to use an "image upload" website, that hosts your image and provides you with a 'direct URL' for it.

Then just click the image button above the  smiley and paste that URL in between the brackets.

Don't feel silly about the printing mistake, I'm too scared to etch myself so I use Vero! (shhh don't tell anyone!)

[duck_arse]

ahhh, the backwards etch! this is a very easy mistake to cover up, you just shove it into a box and screw down the lid. my last build, with stupidly simple and assymetric base attachment method, it wasn't until I had drilled, finished, painted, lettered and laquered the baseplate that I realised ..........

bracket bending time.

[Jdansti]

Well, turns out Kings of Chaos been so on my mind, I only realized now that i printed the pcb inverted from what it should be, face-palm, face-palm, face-palm, face-palm, !!!! Back to reprint,  

ooops, also turns out I cannot post images  

I've done the reverse image mistake more than I care to mention. It took my brain a while to understand that the image on paper is the same image that I would see from the TOP of the board, and when I apply it to the bottom of the board, it comes out reversed when viewed from the bottom. Then I realized that text does need to be reversed without reversing the layout. It's enough to make your head spin if you think about it too much!

[bluebunny]

It took my brain a while to understand that the image on paper is the same image that I would see from the TOP of the board, and when I apply it to the bottom of the board, it comes out reversed when viewed from the bottom. Then I realized that text does need to be reversed without reversing the layout. It's enough to make your head spin if you think about it too much!

?emit erom eno taht hguorht og uoy dluoc ,on gnaH   

[Jdansti]

^Sure.

Iʇ ʇooʞ ɯʎ qɹɐıu ɐ ʍɥılǝ ʇo nupǝɹsʇɐup ʇɥɐʇ ʇɥǝ ıɯɐƃǝ ou dɐdǝɹ ıs ʇɥǝ sɐɯǝ ıɯɐƃǝ ʇɥɐʇ I ʍonlp sǝǝ ɟɹoɯ ʇɥǝ TOP oɟ ʇɥǝ qoɐɹp' ɐup ʍɥǝu I ɐddlʎ ıʇ ʇo ʇɥǝ qoʇʇoɯ oɟ ʇɥǝ qoɐɹp' ıʇ ɔoɯǝs onʇ ɹǝʌǝɹsǝp ʍɥǝu ʌıǝʍǝp ɟɹoɯ ʇɥǝ qoʇʇoɯ˙ Tɥǝu I ɹǝɐlızǝp ʇɥɐʇ ʇǝxʇ poǝs uǝǝp ʇo qǝ ɹǝʌǝɹsǝp ʍıʇɥonʇ ɹǝʌǝɹsıuƃ ʇɥǝ lɐʎonʇ˙ Iʇ,s ǝuonƃɥ ʇo ɯɐʞǝ ʎonɹ ɥǝɐp sdıu ıɟ ʎon ʇɥıuʞ ɐqonʇ ıʇ ʇoo ɯnɔɥ¡

[bluebunny]

^Sure.

Iʇ ʇooʞ ɯʎ qɹɐıu ɐ ʍɥılǝ ʇo nupǝɹsʇɐup ʇɥɐʇ ʇɥǝ ıɯɐƃǝ ou dɐdǝɹ ıs ʇɥǝ sɐɯǝ ıɯɐƃǝ ʇɥɐʇ I ʍonlp sǝǝ ɟɹoɯ ʇɥǝ TOP oɟ ʇɥǝ qoɐɹp' ɐup ʍɥǝu I ɐddlʎ ıʇ ʇo ʇɥǝ qoʇʇoɯ oɟ ʇɥǝ qoɐɹp' ıʇ ɔoɯǝs onʇ ɹǝʌǝɹsǝp ʍɥǝu ʌıǝʍǝp ɟɹoɯ ʇɥǝ qoʇʇoɯ˙ Tɥǝu I ɹǝɐlızǝp ʇɥɐʇ ʇǝxʇ poǝs uǝǝp ʇo qǝ ɹǝʌǝɹsǝp ʍıʇɥonʇ ɹǝʌǝɹsıuƃ ʇɥǝ lɐʎonʇ˙ Iʇ,s ǝuonƃɥ ʇo ɯɐʞǝ ʎonɹ ɥǝɐp sdıu ıɟ ʎon ʇɥıuʞ ɐqonʇ ıʇ ʇoo ɯnɔɥ¡

sramt asre   

[Jdansti]

^ 

[madstayen]

Whooooaaahahahahaha. WTF fellas, I'm already confused as is!!!!!!!!!!!!!!!!!! Right, back to business, reeee-did the pcb, soldered in all the parts (invested in a weller station, HOOAH!), Still waiting on jfets, only have 3 in. Its quite hard to get here where I live. Can I use the 3 that I've put in, and use mpf102's for the other 2? Because that is plentiful here. I machined the dials/knobs from 316L Stainless Steel on my lathe, and knurled it (Gives it that nice criss-cross look). Still have to paint the enclosure. Another question. I presume that the way the image is shown here http://www.diystompboxes.com/smfforum/index.php?topic=46426.msg341613#msg341613 the pots are as they would be looking from the top of the pedal, in other words, where the "GAIN 1M-A" is on the drawing, would actually be the dial/knob? I'm wondering about that, because if it's actually the bottom of the pot, I would have to swap all the wiring on the ends. And where do the 2 grounds go of MID and VOL, it just shows "to ground". I grounded them on the pcb. Is that correct??? thanks guys.

[bluebunny]

Sorry 'bout that...        [ Please Miss!  John started it!! ]

The picture you linked to shows the pots from inside the pedal (which is where the board is too), so from the back - the pot spindles are pointing away from you.  If you connected the two pot "ground" connections to your PCB "ground", then that's fine.  So long as the PCB ground is also connected to ground elsewhere (input/output jacks, -ve battery clip, case, etc.).

[duck_arse]

can you point us at a circuit diagram fer this?

a weller. you've really got no excuse now. and a knob lathe? can you turn up some perspex knobs for me?

[madstayen]

This is the diagram I wanted to use http://img90.imageshack.us/img90/5488/drqz4.jpg , but ended up doing the pcb version here on DIY, which has a couple of different values, and it makes it a lot easier. Have the vero layout as well, but the pcb looks a tad better. I don't have a knob lathe, I have a lathe! In fact, I have two, a small (1000mm bed) Wing, and a big (2400mm bed) Tos Trencin. And a small Huron milling machine, with dividing head and rotary table. So I can manufacture anything with it (but I'm limited to the physical capacity of my machines, but I can do a lot), as I am a Turner Machinist, and a Tool and Die maker by trade. Anyway, digressing, to answer your question, yes I can machine acrylic/perspex knobs for you, but you'll have to pay the export costs to your country, I'll supply the material (plenty at my work) and do the labor for free. Anyway, still waiting on transistors, turns out the only ones I can readily get is BF245B. I can get thousands of them for 4 South African Rand (that should work out something like 0.44 $ US if my math is as good as it should be). Is it possible to use this instead of of J201's? Man I hate living in a country where You literally have to go to the end of space to find something   <---that's me blowing a gasket     <--feeling better now.

[duck_arse]

the bf244 series is a much higher current device than the j201, but then just about everything else is too. the bf244A is a similar Vgs range to the j201, but the 244B should work unless you get some at the high end of the range. they may not provide as much gain, this may be good or bad, I don't know.

I don't find much use for my j201's, so if you want to turn me up some perspex knobs, I'll send you 20 or 30 of them.

[madstayen]

That's good. I'll do it, what should the shank size be, 4mm, or 6mm? Any specific major diameter? Length?

[duck_arse]

ok madstayen, where are we up to? you where showing us photos and we were asking about red-red-green or red-red-black. which was it, and please say it turned out to be 22R and all your problems have been solved on both boards?

I breadboarded just the first 2 stages the other day, and just threw one of each type I have on hand at the circuit as is. funny enuff, the j201 seemed the best suited, along with the 2n5457, as we would expect. the 100k trimmers are really touchy though, so you need a steady, slow hand when biasing to 4~4V5, which seems the magic gain/headroom number.

how many of the bf244b do you have?

[madstayen]

these are the pots








and the rest












oh,and this is the knob


had to work 36 hour shift. going to test and replace the resistor now if need be. will let you know in a bit.

[Jdansti]

duck and mad,

Did y'all see my post about the BF244B pinouts before it disappeared with the rest of last weeks posts?  I'm 99.9999% sure that if you are using BF244Bs, you can't just flip them 180deg and expect them to work. The gate is in the center, not on an end pin as the J201. I still have my drawings:






The board is configured for J201s, so if you want to keep the BF244Bs you'll need to flip them and cross two of the legs. If you do this, you might need to insulate them with a piece of insulation from a stripped wire or heat shrink tubing.  The other option would be to re-do the board and arrange the traces to accommodate the BF244Bs.

[madstayen]

Sorry, been out on an emergency. Am busy replacing the 2M2's, I measure 560k on my meter, don't know how that is possible. Going to replace them with 2M2's, 1W. I am using BF245B's.
They are configured correctly, I double checked that. I hope my problem will be solved with the 2M2 swop!!!!!!!!!!!!!!!!!

[madstayen]

This is part of the data sheet I received with the fets

[Jdansti]

Yes, for the BF245B, you would simply reverse them. A little birdie had told me that you were using BF244Bs (actually it was a duck's butt!) . I'll try to take a look at your photos tonight.

[Thecomedian]

I really like that paint scheme with the red and black flecks. Did you do that yourself? What paint is that?