Search found 148 matches

by Frank_NH
25 Aug 2020, 18:24
Forum: Ready-To-Build Effect Projects
Topic: BAJA Highway 1 [verified]
Replies: 17
Views: 1837

Re: BAJA Highway 1 [verified]

Yes, I chose red LEDs but you can experiment and decide what you like. I'll see if I can locate my build, but my recollection was that it was not as "buzzy" as the original DS-1 but more of a mid-range distortion.
by Frank_NH
25 Aug 2020, 13:27
Forum: Ready-To-Build Effect Projects
Topic: BAJA Highway 1 [verified]
Replies: 17
Views: 1837

Re: BAJA Highway 1 [verified]

Here you go! It's been a while since I looked at this one but it's a nice distortion box. Let me know if you spot any problems with the layout.
by Frank_NH
30 Apr 2020, 12:34
Forum: Amplifiers
Topic: Vox Scorpion V116 schematics
Replies: 2
Views: 662

Re: Vox Scorpion V116 schematics

Interesting amp. Basically comprised of leftover parts from other Thomas-Vox amps. See here: http://www.voxshowroom.com/us/amp/scorp.html I have a Vox Buckingham amp (head and cab) that I've been refurbishing, and it's been a labor of love. Fortunately, I have a schematic and have been able to sourc...
by Frank_NH
28 Feb 2020, 15:22
Forum: DIY Stompbox designs
Topic: BAJA Splawn Quick Rod style Overdrive 160220
Replies: 30
Views: 4341

Re: BAJA Splawn Quick Rod style Overdrive 160220

Thanks again Bajaman, this looks great! In particular, I'm impressed with the "built-in" BOSS-style soft switching circuit. I've always wanted to try this out and was thinking to implement it on a separate veroboard as a generic unit. I would assume that one could then use this switching on any circ...
by Frank_NH
19 Nov 2019, 15:14
Forum: Boutique Stompboxes dissected...
Topic: Pete Cornish - SS-3 Soft Sustain [traced]
Replies: 20
Views: 6017

Re: Pete Cornish - SS-3 Soft Sustain [traced]

I built an SS-2 from the original veroboard layout at Tagboard Effects. What I discovered is that it sounded much better with the Cornish buffer at the input. Looks like the SS-3 has that incorporated into its design, so I'm sure it will sound better than the bufferless SS-2. BTW - I used my SS-2 ex...
by Frank_NH
16 Sep 2019, 15:32
Forum: DIY Stompbox designs
Topic: Fenderizer Pedal
Replies: 12
Views: 2581

Re: Fenderizer Pedal

Can anybody tell me, why is there a 27k resistor on the output? Can't find any need of that much of impedance. I'd also add an input buffer made out of the half of 3rd opamp... I agree - you can drop the 27K resistor at the output. The input probably doesn't need a buffer but if you have an extra o...
by Frank_NH
16 Sep 2019, 13:23
Forum: DIY Stompbox designs
Topic: Fenderizer Pedal
Replies: 12
Views: 2581

Re: Fenderizer Pedal

I like it. You could build this with a charge pump to get +/- 9V for a little extra headroom. Also, nice to see the tone shaping downstream of the volume control. Someone could design a vero layout though I could also build this on my breadboard to check it out for myself. Thanks for posting.
by Frank_NH
26 Jun 2019, 17:04
Forum: Pimp-My-Cheap-Pedal
Topic: Cheap OD pedal to Fuzz ?
Replies: 10
Views: 3763

Re: Cheap OD pedal to Fuzz ?

I should note that my reference to R11 was based on this OCD schematic: http://zadvitsky.com/index.php/projects/pedals/ocd-overdrive-diy.html Also, 3.9K is just a starting point - you could socket the resistor and try different values. If you're modding your pedal by desoldering the existing parts a...
by Frank_NH
25 Jun 2019, 17:08
Forum: Pimp-My-Cheap-Pedal
Topic: Cheap OD pedal to Fuzz ?
Replies: 10
Views: 3763

Re: Cheap OD pedal to Fuzz ?

http://zadvitsky.com/index.php/projects/pedals/ocd-overdrive-diy.html goes through the ocd circuit. component numbering is probably different I'm still learning the actual electronics behind it all, but as somebody who learns from tweaking things i would try: changing the clipping mosfets/diodes to...
by Frank_NH
09 May 2019, 20:34
Forum: DIY Stompbox designs
Topic: Please explain to me this op amp gain stage
Replies: 18
Views: 3245

Re: Please explain to me this op amp gain stage

I think that basically you will have the resistance from the pot wiper to output lug in parallel with R2-C3. As you turn down the op amp gain (and increase the wiper to output resistance), the signal will retain more treble (corner frequency depends on R2-C3). At least that's how I see it. Depends ...
by Frank_NH
09 May 2019, 12:56
Forum: DIY Stompbox designs
Topic: Please explain to me this op amp gain stage
Replies: 18
Views: 3245

Re: Please explain to me this op amp gain stage

I think that basically you will have the resistance from the pot wiper to output lug in parallel with R2-C3. As you turn down the op amp gain (and increase the wiper to output resistance), the signal will retain more treble (corner frequency depends on R2-C3). At least that's how I see it. Depends o...
by Frank_NH
27 Apr 2019, 22:01
Forum: Boutique Stompboxes dissected...
Topic: Klamac El'Mo circuit dissection.
Replies: 7
Views: 2069

Re: Klamac El'Mo circuit dissection.

FYI - A vero layout of the Jerseygirl Fulltender is available here...

https://tagboardeffects.blogspot.com/201 ... r.html?m=1

Also read this thread:

https://www.freestompboxes.org/viewtopic.ph ... &hilit=SRV
by Frank_NH
20 Apr 2019, 19:16
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

Thanks - I'll start a new topic. By the way, I have a correction to make. I rechecked the markings on my BA100 diode and it is actually a BA110! I just received some BA100s from a supplier and they have a slightly lower forward voltage (about 0.67 V) which is nominally above the 1N914/1N4148 but are...
by Frank_NH
19 Apr 2019, 13:09
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

I wasn't going to upload a bunch of spreadsheets in this thread (there's already lots of great info from Manfred and others), but I do plan to collect and measure diode characterstics just as a general ongoing personal project. I'll need to go through my diode collection and I'll probably even cons...
by Frank_NH
18 Apr 2019, 18:19
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

Yes that would be great! However, I suppose this would be better suited to be stickied in the circuit design section or another more appropriate section rather than this thread. It should of course be referenced here, especially ideal replacement types for the ma856 I wasn't going to upload a bunch...
by Frank_NH
18 Apr 2019, 14:36
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

I suppose it may appear that we're going a bit overboard in looking at diode Fv, but this topic seems to come up again and again and not just for the Bluesbreaker or KOT. I've seen many articles online extolling the virtues of specific diodes in various overdrive and distortion circuits for hard and...
by Frank_NH
18 Apr 2019, 12:42
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

Hi Manfred, I also have the MA856 and MA858 data sheets, and also one for the BAS33, and I went ahead and plotted the curves with my 1N4148 and BA100 data on a semi-log plot (the plot format used in the datasheets). The plot is attached. Note that the datasheet curves are the performance @25C and re...
by Frank_NH
17 Apr 2019, 15:44
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

I used a clean 9V power source (not a battery) and arranged a simple circuit on my breadboard with a potentiometer in series with a 1k (1%) metal film resistor and the diode. Varied the pot to provide a range of currents. Measured the voltage drop across the resistor to get the current and the volta...
by Frank_NH
17 Apr 2019, 13:25
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

I took some data last night using my DVM for a plain 1N4148 and the BA100 that I have. I plotted the data in Excel (see attachment) - there's definitely a difference. Also the DVM on its diode setting indicates a difference in forward voltage. One more thing - after doing a little more research, the...
by Frank_NH
16 Apr 2019, 17:25
Forum: Boutique Stompboxes dissected...
Topic: Analogman - King of Tone [traced]
Replies: 463
Views: 164303

Re: Analogman - King of Tone [traced]

Thanks Manfred - very interesting. The BA100 curve looks almost identical to your previous 1N4148 curve. My DVM shows my BA100's FV to be in the 0.7 - 0.75V range, with 1N4148 being about 0.6 - 0.65V. I suppose there can be some variability between specific batches of diodes. Still, I would recommen...