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DIY Effects


JackLondon

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16 hours ago, Sibob said:


Yup, will have a Heliotropic PCB off you 🙂

 

Cheers

Si

Cool, just realised i put the gain pots in the schematic backwards so they'll all work in the reverse... Oh well, this is my first PCB in about 5 years....

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Just now, bobbass4k said:

Cool, just realised i put the gain pots in the schematic backwards so they'll all work in the reverse... Oh well, this is my first PCB in about 5 years....


Will wiring the pots in reverse work to correct it? 
As you say, no biggie really.

 

Si

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1 hour ago, Sibob said:


Will wiring the pots in reverse work to correct it? 
As you say, no biggie really.

 

Si

Yeah just got 1 and 3 reversed on the sustain pot then c+p'd it for the other gain pots. Annoying but no way am I re-laying out the board... Yeah if you wanted to swap pins 1+3 that'd work, I've designed for the alpha right angle pots though so you'd have to snip and run wires. PCBs are ordered - got 10 for $3.20 on slow delivery with a first time order voucher - I do not understand how that's economically viable but I ain't complaining.

 

Edit - I was going to post the heliotropic schematic but I didn't realise fuzzrocious were still making them. Fuzzrocious are good eggs so I don't want to publicily post an in production pedal, anyone wants the schematic drop me a PM.

Edited by bobbass4k
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9 hours ago, bobbass4k said:

Yeah just got 1 and 3 reversed on the sustain pot then c+p'd it for the other gain pots. Annoying but no way am I re-laying out the board...

 

Put the pots on upside down?

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16 hours ago, tauzero said:

 

Put the pots on upside down?

I'll have to test it out when I get the boards, I suspect it may bring the knobs too low and interfere with footswitch, it's an 80mm X 60mm PCB for a 1590BB, but yeah definitely an option. 

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13 minutes ago, bobbass4k said:

I'll have to test it out when I get the boards, I suspect it may bring the knobs too low and interfere with footswitch, it's an 80mm X 60mm PCB for a 1590BB, but yeah definitely an option. 

1590BB! - surely you'ld want to aim for 1590A  :D 

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10 hours ago, bobbass4k said:

These arrived far, far too quickly for £3.29. gonna put one together tonight. 

 

17268336239516417303614697427882.thumb.jpg.0da20cb020927387eaffeb97de80efbc.jpg


Ooo, how long will it take you to verify/build one?

 

Si

Edited by Sibob
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19 hours ago, Sibob said:


Ooo, how long will it take you to verify/build one?

 

Si

Works apart from 2 additional stupid mistakes, I forgot a cap on one of the gain stages (cut a trace and add a cap across 2 pads) and the pins on the j201 symbol are apparently wrong, so the through hole and SMT pads are wrong. I had some through hole j113s that I twisted the legs on and seen to work just fine. I was in a rush to get them made and skipped some more thorough double checking...

 

I'm gonna redesign the board but you're welcome to one of these, they're simple hacks (I'll cut the trace so you know it's the right one)

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3 hours ago, bobbass4k said:

Works apart from 2 additional stupid mistakes, I forgot a cap on one of the gain stages (cut a trace and add a cap across 2 pads) and the pins on the j201 symbol are apparently wrong, so the through hole and SMT pads are wrong. I had some through hole j113s that I twisted the legs on and seen to work just fine. I was in a rush to get them made and skipped some more thorough double checking...

 

I'm gonna redesign the board but you're welcome to one of these, they're simple hacks (I'll cut the trace so you know it's the right one)


To be fair, I’m in no rush….unlikely to build it any time soon. So if you’re going to redesign, I’ll wait for one of those…if that suits you of course?!

 

Cheers ☺️

Si

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15 hours ago, Sibob said:


To be fair, I’m in no rush….unlikely to build it any time soon. So if you’re going to redesign, I’ll wait for one of those…if that suits you of course?!

 

Cheers ☺️

Si

That's fair, I'm annoyed cos I was going to triple check the schematic after I'd laid the board out but I thought it would be fine... Gonna try and add SMT pads for the 5089s as well as to-92 versions are harder to get hold of now apparently...

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4 hours ago, bobbass4k said:

That's fair, I'm annoyed cos I was going to triple check the schematic after I'd laid the board out but I thought it would be fine... Gonna try and add SMT pads for the 5089s as well as to-92 versions are harder to get hold of now apparently...


Have you got a BOM handy? Will figure out what I need in the meantime!

 

Cheers

Si

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On 20/09/2024 at 13:00, bobbass4k said:

These arrived far, far too quickly for £3.29. gonna put one together tonight. 

 

17268336239516417303614697427882.thumb.jpg.0da20cb020927387eaffeb97de80efbc.jpg

Were you using KiCad? 
I loved how simple it was to learn to use but the symbol/footprint libraries seemed crazily complex to manage and find a set of things that would do what I wanted - for instance I couldn’t find a footprint for jfets that would let me do through hole or smd like you have

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1 hour ago, LukeFRC said:

Were you using KiCad? 
I loved how simple it was to learn to use but the symbol/footprint libraries seemed crazily complex to manage and find a set of things that would do what I wanted - for instance I couldn’t find a footprint for jfets that would let me do through hole or smd like you have


I’ve not done any layouts at all since Eagle died a death….sounds like there’s nothing quite like it for us small-time users! 
 

Si

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20 minutes ago, Sibob said:


I’ve not done any layouts at all since Eagle died a death….sounds like there’s nothing quite like it for us small-time users! 
 

Si

I’m pretty sure kiCad is the answer with the right set of libraries! 
have I found the right set of libraries yet…

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1 hour ago, LukeFRC said:

Were you using KiCad? 
I loved how simple it was to learn to use but the symbol/footprint libraries seemed crazily complex to manage and find a set of things that would do what I wanted - for instance I couldn’t find a footprint for jfets that would let me do through hole or smd like you have

If Farnell or Mouser stock the item you can use their service to create a footprint. If they have not got on it takes a day or two and they can make you a footprint.

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17 hours ago, LukeFRC said:

Were you using KiCad? 
I loved how simple it was to learn to use but the symbol/footprint libraries seemed crazily complex to manage and find a set of things that would do what I wanted - for instance I couldn’t find a footprint for jfets that would let me do through hole or smd like you have

Yeah footprints are a bit of a pain in Kicad - I tried creating one for TH/SMT together but I got impatient and eventually just bodged it, I just added an extra J201 symbol to the schematic in parallel and set that to an SMD footprint...

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I've got a lovely and varied selection of low-gain germanium transistors, all pnp.

 

Thinking of making an overdrive/ fuzz with a six-way two pole switch to change the transistor. Plus extra gain stages.

 

Do the panel think the original fuzz-face circuit would be a good starting point?

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7 hours ago, Stub Mandrel said:

I've got a lovely and varied selection of low-gain germanium transistors, all pnp.

 

Thinking of making an overdrive/ fuzz with a six-way two pole switch to change the transistor. Plus extra gain stages.

 

Do the panel think the original fuzz-face circuit would be a good starting point?

Not sure - designing yourself or building something?

here’s someone’s list of PedalPCBs projects that use pnp https://forum.pedalpcb.com/threads/pnp-pcbs.17150/

of them duocast mini looks interesting

 

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I built the duocast with a 70's transistor - lovely thing. I've never really used it for fuzz, but the overdrive is really good - it's a bit of a secret weapon more like overdriving an old desk. It also has a transformer in it.

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10 hours ago, LukeFRC said:

Not sure - designing yourself or building something?

here’s someone’s list of PedalPCBs projects that use pnp https://forum.pedalpcb.com/threads/pnp-pcbs.17150/

of them duocast mini looks interesting

 

 

Want to design it myself.

 

In the spirit of 'Doc's Monster Fuzz' which I put together around 1984.

 

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16 hours ago, LukeFRC said:

Not sure - designing yourself or building something?

here’s someone’s list of PedalPCBs projects that use pnp https://forum.pedalpcb.com/threads/pnp-pcbs.17150/

of them duocast mini looks interesting

 

 

Useful to see different ideas. To be true to the monster fuzz, I recall there was a transistor stage and (dual?) Op amp stage.

 

I will probably go with a gentle transistor stage and experiment with 'klon-like' assymetric clipping using germanium diodes. I will bulid it on a prototyping board first.

Edited by Stub Mandrel
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