Earthquaker Devices - Arrows [traced]
Nothing too complicated - haven't compared it to the Black Eye etc. yet but it must be a revision of something familiar? AMZ Booster maybe?
- storyboardist
- Breadboard Brother
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- storyboardist
- Breadboard Brother
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- FeVeR2112
- Breadboard Brother
Would you not just use the diode for polarity protection? A 4001 diode (1A) can handle pedal supply which are mostly 500mA at best.guiddruid wrote:Limit current through D1 to ~90mA when the power is connected backwards.FeVeR2112 wrote:What does the R2 100R resistor do
- Nocentelli
- Tube Twister
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I always understood that a ~100 ohm resistor + large electro capacitor together form a filter for the power that reduces hum.
modman wrote: ↑ Let's hope it's not a hit, because soldering up the same pedal everyday, is a sad life. It's that same ole devilish double bind again...
- guiddruid
- Breadboard Brother
Without the resistor, you're relying on the power supply to gracefully limit itself - not pop a fuse, burn out a voltage regulator, or blow D1. Best practice is to assume worst case conditions, which for this protection circuit would be a very low output impedance for the PSU.FeVeR2112 wrote:Would you not just use the diode for polarity protection? A 4001 diode (1A) can handle pedal supply which are mostly 500mA at best.
C4 would need to be moved to be in parallel with D1 for R2 to help with filtering noise. That would also protect C4 - the only polarised component in the design (other than the diode) - from reverse voltage.Nocentelli wrote:I always understood that a ~100 ohm resistor + large electro capacitor together form a filter for the power that reduces hum.
I recently did on the perfboard this nice pedal, it's for a friend, who asked for a mod on frequency boost. So I put a switch on c2 to choose from 4.7n 47n and 100n, a common mod in rangemaster.
But with this layout nothing happen, no sound change. Just the original (very nice indeed) sound.
How can I explain this?
But with this layout nothing happen, no sound change. Just the original (very nice indeed) sound.
How can I explain this?
- soulsonic
- Old Solderhand
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Input impedance is too high to give treble booster sounds with those C2 values. You'd have to go considerably smaller than 4,7n to get a significant bass cut. And there's already so much low end from 47n, that 100n wouldn't make any difference you'd hear.warsavius wrote: ↑12 Dec 2020, 17:30 I recently did on the perfboard this nice pedal, it's for a friend, who asked for a mod on frequency boost. So I put a switch on c2 to choose from 4.7n 47n and 100n, a common mod in rangemaster.
But with this layout nothing happen, no sound change. Just the original (very nice indeed) sound.
How can I explain this?
Try: 500pf, 1nF, 2.2nF... small values like this for a treble booster sound. 10nF or 22nF would probably be more than enough for full range sound.
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran
- CheapPedalCollector
- Resistor Ronker
Pretty lame they charge so much for a pedal with $5 worth of parts in it.
Ok, it's fine with switchable 4,7n and 1n input cap. Not too harsh like a Rangemaster, fully useful and reliable for single coils or humbucker with smaller cap. Thanks for the suggestion.soulsonic wrote: ↑13 Dec 2020, 01:01Input impedance is too high to give treble booster sounds with those C2 values. You'd have to go considerably smaller than 4,7n to get a significant bass cut. And there's already so much low end from 47n, that 100n wouldn't make any difference you'd hear.warsavius wrote: ↑12 Dec 2020, 17:30 I recently did on the perfboard this nice pedal, it's for a friend, who asked for a mod on frequency boost. So I put a switch on c2 to choose from 4.7n 47n and 100n, a common mod in rangemaster.
But with this layout nothing happen, no sound change. Just the original (very nice indeed) sound.
How can I explain this?
Try: 500pf, 1nF, 2.2nF... small values like this for a treble booster sound. 10nF or 22nF would probably be more than enough for full range sound.
- Ben N
- Cap Cooler
Ummmm, no, not at all. It's a simple BJT NPN single stage boost - kind of similar to an LPB-1 or Gus Smalley's NPN Boost, with a tiny, subtle bit of tone shaping. There's nothing terribly clever about it, but it's a useful gadget for a variety of purposes. I build one and like it, but I'm not using it for the moment because my home amp has a solid state preamp, and I like this much better in front of a tube preamp. But I'm sure it will come in handy at some point.
- soulsonic
- Old Solderhand
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I apologize for the off-topic post, but: Maybe we shouldn't be categorizing EQD as "boutique" anymore? Mass produced things you can find at any big chain store doesn't seem "boutique" to me. Same can be said for several other brands that were considered boutique in the past. Wampler comes to mind...
"Analog electronics in music is dead. Analog effects pedal design is a dead art." - Fran