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  1. VenomBallistics

    Passive equalizer

    okay ... so basically you're trying to "offshore" your guitars tone control. I can see some value in this. however, as we deviate from a simple treble bleed as we have in out guitars, we start to get outside the passive wheelhouse. Passive methods can only make reductions and they cannot do so...
  2. VenomBallistics

    MP3 player hum

    one last thing to try ..... chokes in the outputs like they do for class D amps something in the range of 7uH to 33uH is what I get from a random scan of datasheets. Option B 10K should be sufficient, assuming you're going into some kind of amp. And yeah ... I looked at the application list for...
  3. VenomBallistics

    MP3 player hum

    could it be the "seeduinio"?
  4. VenomBallistics

    Passive equalizer

    You really should get over your fear of active circuitry. Often times, after we hack, slash, and sculpt a signal via passive means, we encounter a need to amplify the product back to a usable level anyhow. Just embrace it The Boss MT-2 "Covid tracking chip" has a really good three band...
  5. VenomBallistics

    Back to the Breadboard

    the 1M typical input load resistor ties the op amp to Vref, while offering a path for your signal. Without it, the opamp sees whatever static charge is present as its reference and the signal has nowhere to go
  6. VenomBallistics

    Back to the Breadboard

    [mod edit: remove double quote] it's just additive noise. the amp has some noise, the guitar is picking up as much noise as it can find, pedals have some too ... then there's environmental noise from broadcast TV and radio, EMI from industrial operations .... as you stack them, the noise adds...
  7. VenomBallistics

    Back to the Breadboard

    yeah ... the bane of the recording guitarist. the average pickup and high Z amp input could be used for intergalactic espionage. it picks up everything. The intro to Satrianis flying in a blue dream was the result of RFI in an LA studio. Your tone shape observation is characteristic of OpAmp...
  8. VenomBallistics

    Fan not working on chinese room heater

    PN8024 is a "non isolated AC to DC converter" Cursory pricing shows these are cheaper than most transistors and the datasheet is in Mandarin. It reminds me of a guy that was always begging for design help, forced to using things cheaper than we ever knew existed. We eventually figured out we...
  9. VenomBallistics

    Back to the Breadboard

    BYOC seems to largely agree with your spirit. Some kits are so you can just knock one off, others are designed around experimentation and exploration. The Royal Beaver is a good example of this. It takes the various historical Big Muff fuzz effects as well as other related competing circuits and...
  10. VenomBallistics

    Back to the Breadboard

    https://buildyourownclone.com/ You might want to check out this site. Back when I worked on this stuff, they sold a few obscure parts and something like three kits. The net is rife with bad schematics, and BYOC was one of the few that put some effort into sorting things out. It's also one of...
  11. VenomBallistics

    Back to the Breadboard

    nope ... never .... you can't prove otherwise o_O
  12. VenomBallistics

    Back to the Breadboard

    why yes ... but for now it seems the objective is diagnostic in nature. unity into unity in a +/0/- supply would pass of fail the component just as well as the 9/4.5/0 of the divider supply.
  13. VenomBallistics

    Back to the Breadboard

    yeah ... that's kinda sketchy ... your 9V and 4.5V will be in business for themselves. the divider is the cheapest ... a center tapped, bridge rectified 9V transformer would be great, giving you +4.5/0/-4.5. You can just tie your output to - input for a unity gain input buffer. This is commonly done
  14. VenomBallistics

    Distortion Pedal Redux

    sorry about that ... funny thing is, I knew AG from another, now defunct forum called "Dutchforce". We weren't at all close then, but I can't figure out why he's so adversarial here. He wasn't this way before. If you comb through, you'll see a few exploration and construction tips that I hope...
  15. VenomBallistics

    Distortion Pedal Redux

    which is yet another area for modification. you must also bear in mind that these devices are not something we'd ever want in the signal chain of our HiFi equipment. we are not really trying to reproduce a sound, but rather produce one. sculpting bending slicing and dicing is part of the tool...
  16. VenomBallistics

    Distortion Pedal Redux

    "Vr" indicates the 4.5V floating ground at both the 4.7K pictured AND the 10K you cut off. It is NOT the same With the gain pot (500k) at zero, it provides a gain of 10.8, which stays under breakover of the diodes while producing a signal that can better survive the passive filters used for tone...
  17. VenomBallistics

    Distortion Pedal Redux

    you are working with a tiny amplifier that would prefer to be treated like a big one that would deliver an AC current to drive a speaker. To do this, it uses a three point power supply where you have a +V, a -V and a 0V ground, the AC output is a product of the output stage using a pair of...
  18. VenomBallistics

    Distortion Pedal Redux

    an and the inverting input references battery - in the TS 808, and most others I've cracked into, this input also references the floating ground (Vr in the 808 schematic) and not battery -. Essentially, we treat them as we would a class B power amp, but in miniature, and let it pretend it's in...
  19. VenomBallistics

    Distortion Pedal Redux

    it also applies Vref to the non inverting input. You have strung this guy along over three pages of failure and mediocre results, from a set of components that should just work. its not hard man ... bring it up to floating ground, amplify it and cram it through some diodes, amplify what's left...
  20. VenomBallistics

    Distortion Pedal Redux

    the TS 808 schematic is available here https://schematicheaven.net/effects/ggg_ibanez_ts-808_ORIGINAL.pdf You don't actually think you're just going to build ONE peddle ... do you?
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