Recent content by debrad

I completed my Gravitation build and noticed the 78L05 was getting QUITE warm during a 5 minute test. Quickly realized the regulator was flipped 180 degrees and made the correction. Everything SEEMS to be working OK but just wondered what kind of damage (if any) may have been possible?

I may not have been clear @jwin615 but this new strange behaviour (4.7k at max resistance and a higher resistance (5.2k) as I turn the pot towards "min") is happening with the un-modified pot (i.e. the one that I didn't cut the traces on) so, if anything, it would only be due to the parallel...

Well...still not all that much blend but a little better than the 20k pot alone and the individual inputs appear to be well separated at the min and max postions (also DEFINITELY better than the 100k pot I started with)! Thanks everyone!! Interesting side note...the parallel resistors do some...

I have some 6.2k resistors but I just tried them and I think that the steps I took in converting these MN taper pots to "no load" (i.e. creating a physical break between the ground lugs and their respective tracks) MIGHT present a problem. For one set of lugs, when the pot is fully "off", I...

Now that I have replaced the original 100k MN taper pot with a 20k pot, would that give me 12k effectively and will the resulting taper match with what @Bricksnbeatles has drawn above? Is the trial and error the best way to find the appropriate parallel resistor or was there a specific reason...

Thanks @thunderaxe , I edited my note above because I had actually used a 100k MN taper pot rather than a 200k. I replaced that 100k with a 20k and there is a slight improvement but it's still mostly on/off (there is SOME blend between 11:00 and 1:00 on the pot rotation). I think 1k or maybe...

Back again to let you know that I finally got my Hyped Fuzz built now that Canada Post's strike is over and my parts were delivered. I implemented a blend between the "Scooped" and "Full" paths by replacing the toggle switch with a 200k 100k MN dual pot as outlined by "WalterW" in this thread...

Thanks everyone. That was my assumption (…and I THOUGHT I perceived more of a bevel on that edge) but I wanted to make sure before soldering. BTW, for those who were thinking it, I DID search and read datasheets but none that I found were any help…perhaps I didn’t search hard enough?

I'm working on the PedalPCB Tone Generator and it's my first real foray into SMD components outside of the odd few repairs I have done in the past. Everything seems to be going fairly well but the silk screen shows the orientation of a PDIP-8 type of chip and I can't figure out where PIN1 is on...

Before installing my Two Tone Fuzz board in its enclosure...I loaded it up with 3 silicon PNP transistors just to make sure it worked (I'm waiting for some PNP Ge transistors to arrive but it might be a while given our current postal strike here in Canada...). The silicon PNPs came from...

A friend of mine has asked if I can build him a Hyped Fuzz with a "Blend" or "Mixing" knob instead of the 3 way Mode toggle. In my research, I came across a post from @Grubb (Hyped Fuzz Mode Blend) who was trying to do the same thing but didn't receive any answers to his questions so I will ask...

There is another note in an earlier post on this pedal (Panspermia) that may help with the volume issue: Fourth, there is a 22k resistor soldered onto the volume pot itself (not on the pcb) between lugs 1&2, which makes it parallel to the 1M that is also between lug 1&2, meaning it's more like...

@leadfoot, I used the 1N4148 instead of 1N34a and the pedal seems to function as it should

Here's a shot of my final assembly. Seems to work like all the other demo videos I have watched. Did you note the comment from @aelling that says: 1N914/1N4148 work much better than 1N4001 for the two that go to the inputs on the 386. I tried some 1n34a also, and they were very very noisy...

Thanks @darwin999, I really appreciate you taking the time to respond. I understand the complications that arise from measurement methods and it's important to keep that in mind but maybe a little outside the scope of my question. In my case, I measured everything with the same device so...