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  1. drew.spriggs

    Resistors 100R and 47R

    R just means resistance - makes it clear that 100 is 100, and not 100k.
  2. drew.spriggs

    (Unaffiliated) NOS Soviet component supplier recommendation!

    Howdy, I've just had my third order turn up from SOVCOM on eBay - first two orders were perfect (and 10/10 transistors I ordered were right in the middle of the gain ranges with minimal leakage), but this order got lost somewhere in the Ukrainian post system (which is understandable given...
  3. drew.spriggs

    What's your nemesis circuit?

    I attempted to make a Woolly Mammoth 4-5x when I was much younger (15 or so years ago) and never got it to work. Last year I made a PCB for one and it worked perfectly the first time.
  4. drew.spriggs

    Isosceles Boost - No worky

    Sooo... I was poking around with my multimeter to check other voltage points while it was on and suddenly it started working. I've wiggles and moved every single component I was near and can't make it stop working. Maybe some sort of tiny short I couldn't see? No idea. With that being said, it...
  5. drew.spriggs

    Isosceles Boost - No worky

    Weirdly enough I have the exact same issues as this guy, just with wildly different voltages around the transistor - which leads me to believe there's definitely some fuckery around there. https://forum.pedalpcb.com/threads/isosceles-boost-issues-tiny-no-signal-when-engaged.5944/ He also notes...
  6. drew.spriggs

    Isosceles Boost - No worky

    All switches/knobs do something, but it just sounds incredibly misbiased - no sustain, super farty, etc. It does appear the tone controls are working, but it's really hard to hear with how little noise I get out of it. Confirmed all components are correct (couple of minor changes; pulldown is...
  7. drew.spriggs

    Panelizing and having break-off parts produced.

    You can panelize with KiKit
  8. drew.spriggs

    Is it ok to have copper pours with deviations and edges like this?

    Shouldn't be a problem - you should be able to set up an exclusion zone to remove it if you're really concerned though
  9. drew.spriggs

    What’s the deal with V.Bias

    Op-amps typically want to see a bipolar power supply - something like +/-9v (with reference to ground). Just using a 9v battery you only have a unipolar supply (+9v/0, or -9v/0 if you flip the battery), so by using a equal resistive divider you get +9/+4.5/0. If instead of the ground/zero...
  10. drew.spriggs

    Fiber Laser Making PCBs

    Tell me about it :p It's cool for vibes, but absolutely isn't worth it either from a cost or time perspective.
  11. drew.spriggs

    Fiber Laser Making PCBs

    Just cutting tracks? Easy. However the whole process is: cut tracks cut half through-holes cut positioning jig removing board, cutting rear tracks applying UV-cure solder mask to both sides removing solder mask from both faces cutting through-holes all the way through cutting board outline As...
  12. drew.spriggs

    Tear jerker Problem

    There's barely an offboard connection there that doesn't look like it's got a short, and with that much damage to the PCB I would be shocked if you hadn't got multiple trace issues
  13. drew.spriggs

    Real Spring Fet Reverb (Surfybear)

    NE5532 will easily drive most reverb tanks, and plenty of schematics out there for full send/return circuits with all controls included.
  14. drew.spriggs

    How do I make a via connect Ground 1 and Ground 2 planes without making them the same NET?

    Create your two separate ground planes as nets (ie. I use GND and GNDD just to make life easy). Place a symbol called "Net Tie" on your schematic, and connect the ground to it on opposite sides. Attach a footprint to it - use any of the generic ones (just redesign it to suit once in PCB...
  15. drew.spriggs

    Anybody used CNC'd faceplates?

    Going off datasheets, you can get away with 2mm if you skip the washer (which matches up to what I've done before with ply faceplates). 1mm doesn't leave a lot of room for a CNC engrave + paint fill, unless I'm using some sort of carrier to keep everything flat (and facing on the CNC again).
  16. drew.spriggs

    Anybody used CNC'd faceplates?

    I've had an idea for finishing a Duocast enclosure off and I think the easiest way is going to be CNCing an aluminium plate (and filling the etching in with black paint). Has anybody done this, and if so what thickness/etc of aluminium did you use?
  17. drew.spriggs

    Thinner enclosures for easier drilling

    2mm aluminium is already very easy to drill - why would you need thinner than that?
  18. drew.spriggs

    NJM5534D substitute?

    Well...no. There's quite a bit of difference between them, and you absolutely can't sub a 5532 for a 5534 without extensively redesigning the circuit - one is a single and one is a dual
  19. drew.spriggs

    Greer Amps Black Mountain volume pot

    Potentially. Post a schematic
  20. drew.spriggs

    circuit modifications in amps

    My previous job was working on power supplies capable of putting out 52v....with a short current of over 100kA. You had to use fully insulated tools everywhere; not for the risk of electrocution, but because a short would likely turn whatever you were holding directly into plasma and the...
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