Saturday, 13 October 2018

JHS Angry Charlie V3

Original FSB thread available here.



34 comments:

  1. Great work Alex! Looks like it should read 20 x 18 though.

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    1. Thanks Gavin. Changed the 6K8 resistor to 10K

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  2. the 6k8 at the bottom right (to 2n2 to treble 2) should be a 10k btw if you look at the original pictures.

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    1. I would socket that resistor and then let your EARS decide what sounds best for that one :-p

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    2. What does that control?

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    3. I think thats treble range. But in the pedalpcb schematic which i think this is derived from its 6k8. But again ears. The pedalpcb sounded great with that but i may experiment with this one.

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    4. Yes, your ears must decide. The schematic from pedalpcb however has a small mistake. If you take the time to look at the gutshot on FSB from which pedalpcb made the schematic, you will see it is 10k not 6k8. Again, the difference is very small in the operation of the treble knob.

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  3. Would it have been easier to use a single channel opamp at the end of this circuit for the EQ section? Does useing a 2 channel opamp make it sound different somehow even though it only uses one channel of the opamp? Sorry if this is a stupid question but i want to try and understand what or if there is a difference in the sound? I'm thinking maybe the empty channel used for Vref does something to power consumption there for causing the audio channel to fluctuate or SAG like a tube amp being pushed as hard as it will go.that is just a guess though.Is there a name for this type of use of the last opamp?sorry so long of questions

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    1. Very good question! It is also a matter of taste. It is used to stabalize the voltage output. Here is some reading:
      http://www.learningaboutelectronics.com/Articles/Buffer-voltage-stabilizer-circuit.php
      You can argue if it is necessary. Most effectpedals do not use it so it is safe to leave it out and just use a 47u or 100u eleco instead. However, if stability is a must have then please do use it.

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    2. and also here some more info on the voltage follower:
      http://www.learningaboutelectronics.com/Articles/Voltage-follower

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  4. On the pedal pcb edition, i had much better results with 2 5532’s or a 5532 and a 2604 for the lm833. Incase anyone gets oscollation at cranked gains.

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  5. Thank you Arnold for the info I book marked both for future reference.

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  7. ...finished this one. works with oscillation problems in some settings even I changed to 5532’s ... and that I wouldn’t use btw. So it’s ok for me.
    Though ... great sound and feel. I like it very much so far.

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    1. ... i meant that oscillating problem is with mid maxed ... never use that ;-)

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    2. Does putting a buffer in front of this one stop the oscillation issue?

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    4. ... i do not really know if a buffer does prevent it from oscillation for sure .... I reopened it to put the internal wires more clean ... and the oscillation is gone ... probably my mistake while building it ... maybe IN and OUT wires where too close ... ? So now it is perfekt for me. Still a bit noisy to me. Probably because it’s my first Higain Pedal ;-)
      anyway - I love it very much. Thank you Alex for making this layout. This is already one of my favorites !

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    1. thank you Alex for this layout ... and al the other ones you made before !!!

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  9. It's quite easy to get oscillations in high gain effects. I've been making pcbs for quite a while and I made 3 versions of the triple wreck till I created a nice oscillation free layout. All I can say is, never give up, try new things, keep input as far away from output as possible, and always thank Alex for building this monstrous blog full of inspiration :) hey alex, are you from the UK?

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  10. Can someone define oscillation in this context? I understand the fact that on max gain the effect will squeal like a pig even without a signal, but I never heard a rotating/thumping/oscillating sound.

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  11. i hope that maybe this info can be helpful for anyone building it !
    The first time I started the pedal there was a beeping tone ONLY when I set gain to max and maxed the mids too. the treble control did change the pitch a little bit.
    After reopening and putting the wires on different locations _ the problem was gone
    An experienced pedal builder told me that on highgain pedals input and output cables, that are too close can cause that problem ... maybe that was the reason.
    I am quite sure, that the problem was because I did that mistake not because of the layout. That is great and seems to be fine !

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    1. yes. The pedal did „squeal like a pig“ :-D

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    2. Exactly :) and not just keep the input and output far away, but also if possible, on the board the various stages should not interfere with each other :) after making pcbs for triple wreck, rat, vh4, I had to learn it the hard way :D also trying to pack things into tiny boxes is a huge problem! Alex designs veroboaeds that have the advantage of space, all resistors laying flat. Standing resistors squeeze the size but bring back oscillations and noise :) so a big thanks to Alex once again!

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  12. I just finished the PedalPCB fabricated board. I used the 10k resistor as Arnold Dikstaal pointed out above. I have no squeal, no problems. One cool thing about the PCB layout is the separation of input to output. Even the input to output wires from board to stomp are very minimal, and they have the ground wire between them, acting as a little shielding, if you use the daughterboard that he sells there. I know this isn't the place for plugging a PCB manufacturer, but the build was just really easy to box up. I'll post a pic soon.

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  13. So, here's the pics of my pedalPCB.com build. I went to the dark side - LOL! But have no fear, I have three veroboard pedals on the bench right now.
    https://ibb.co/buYtkq
    https://ibb.co/egDtkq

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  14. Hello guys, sorry for asking this in the totally wrong place but Google didn't help much so... I happen to be in London for a couple of days, does anyone know of any good electronics hardware shop around? Thanks!

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    1. Hey, you could try RS Components in Southall, Watford or (most centrally) Bermondsey. I've not been to their outlets but their website is great for mail order.

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  15. Hey guys, new here...I got a guy to make one of these for me, but it doesn't have enough treble for my liking. Could someone be kind enough to tell me, how would I increase the range of the treble knob by say, around 20-25%? A resistor or cap change?

    Thanks,
    Phil

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    1. Quickest I think would be trying a 250K potentiometer for the treble.

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