Search found 539 matches

by Dr Tony Balls
Yesterday, 13:52
Forum: Pedal Debugging & Troubleshooting Support
Topic: Bazz Me Fuss You has no octave effect
Replies: 3
Views: 119

Re: Bazz Me Fuss You has no octave effect

Have you tried asking JHS? Pretty sure he's the inventor of this circuit.
by Dr Tony Balls
14 Mar 2024, 13:59
Forum: Boutique Stompboxes dissected...
Topic: Farm Pedals Bucket of Nails
Replies: 2
Views: 482

Re: Farm Pedals Bucket of Nails

stolen wrote: 14 Mar 2024, 11:14 bet it's another rangemaster w bigger caps :3
Yep.
by Dr Tony Balls
30 Jan 2024, 14:41
Forum: Boutique Stompboxes dissected...
Topic: Catalinbread - SCOD (Super Charged Overdrive) [traced]
Replies: 137
Views: 85260

Re: Catalinbread - SCOD (Super Charged Overdrive) [traced]

They are 9.1V zeners for protection on the BS170s (a la ZVEX SHO). There are no other diodes in the circuit. I have built this circuit and made a vero, however it was for this circuit and a Catalinbread Hyperpak in the same box, so the board has two circuits on it. Probably not what you need, but ha...
by Dr Tony Balls
19 Jan 2024, 15:08
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EHX - Echoflanger [schematic]
Replies: 197
Views: 154851

Re: EHX - Echoflanger [schematic]

Thanks for the explanation!
by Dr Tony Balls
19 Jan 2024, 15:06
Forum: Pedal Debugging & Troubleshooting Support
Topic: Capactitor Questions
Replies: 3
Views: 639

Re: Capactitor Questions

Thanks for the explanation!
by Dr Tony Balls
18 Jan 2024, 21:16
Forum: Pedal Debugging & Troubleshooting Support
Topic: Capactitor Questions
Replies: 3
Views: 639

Capactitor Questions

I cross-posted this but the other version was in a thread about the EHX Echo Flange, and I understand how that could seem daunting. However my question is fairly generic, I think... Original post: https://www.freestompboxes.org/viewtopic.php?p=297524#p297524 I have two questions regarding this schem...
by Dr Tony Balls
15 Jan 2024, 20:55
Forum: Vintage Stompbox Corner ( ... - 1975)
Topic: EHX - Echoflanger [schematic]
Replies: 197
Views: 154851

Re: EH Echoflanger [schematic]

Not allowed to edit posts? Anyway, ignore previous schematic. Biasing for MN3007 wrong. Here. I have two questions regarding this schematic. This really relates to the original schematic but Paul's re-draw here is much easier to follow so we'll go with that. 1. Are C6 (50uF) and C7 (50uF) redundant...
by Dr Tony Balls
11 Jan 2024, 15:22
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Smitty Pedals Smitty Bender 1.5 Guts
Replies: 7
Views: 1160

Re: Smitty Pedals Smitty Bender 1.5 Guts

LOL at this discussion. I just built some Attack Decays on stripboard. Its fun, relax.

Image
by Dr Tony Balls
06 Jul 2023, 12:51
Forum: DIY Projects
Topic: DIY Tape Echo
Replies: 3
Views: 1072

Re: DIY Tape Echo

Posting a link to your website might be helpful
by Dr Tony Balls
31 Dec 2022, 16:38
Forum: Pedal Debugging & Troubleshooting Support
Topic: MXR Blue Box Assistance/Question [SOLVED]
Replies: 5
Views: 730

Re: MXR Blue Box Assistance/Question [SOLVED]

It sounds like you have a too low corner frequency in a high cut filter somewhere. Try removing c3 and c4, and see if the issue persists. THANKS for the assist. I removed C4 and high pitched squealing all around, but when I replaced it used a different cap which solved the issue just fine. I measur...
by Dr Tony Balls
30 Dec 2022, 14:20
Forum: Pedal Debugging & Troubleshooting Support
Topic: MXR Blue Box Assistance/Question [SOLVED]
Replies: 5
Views: 730

Re: MXR Blue Box Assistance/Question [SOLVED]

Did you maybe mix up C3 and C4? Nah, those are correct. I should mention that i've checked my build a few times now. Accuracy to the layout, and that all the parts are of the correct value. I started with 2N3904 transistors and had the problem, then tried replacing them with MPSA18 (the reissues ca...
by Dr Tony Balls
29 Dec 2022, 21:15
Forum: Pedal Debugging & Troubleshooting Support
Topic: MXR Blue Box Assistance/Question [SOLVED]
Replies: 5
Views: 730

MXR Blue Box Assistance/Question [SOLVED]

Howdy All, Been messing around with the MXR Blue Box circuit and i'm running into an issue. Basically i'm getting a decrease in volume the higher the note is that i'm playing. Notes played on the low E string are loud and clear and as I move up in frequency the volume drops to the point where an ope...
by Dr Tony Balls
10 Oct 2022, 14:02
Forum: Davidoff Library
Topic: Steve Daniels, Unijunction Tremolo, in: Electronics Hobbyist, Spring-Summer 1971 🇺🇸
Replies: 6
Views: 906

Re: Steve Daniels, Unijunction Tremolo, in: Electronics Hobbyist, Spring-Summer 1971

cspar wrote: 07 Oct 2022, 21:29
Dr Tony Balls wrote: 07 Oct 2022, 13:53 Wasnt the original Small Bear guy named Steve Daniels? Is it the same one?
Yes, one in the same.
Neat! Didnt know that.
by Dr Tony Balls
13 Jul 2022, 13:28
Forum: Modern Stompbox Effects (1975 - ...)
Topic: Zeus Audio Systems - Model 8444 Pre-Amp [schematic]
Replies: 9
Views: 6986

Re: Zeus Audio Systems - Model 8444 Pre-Amp [schematic]

I can't edit the original post, it seems, so here are the images from it: https://live.staticflickr.com/4436/36271102161_f027043964_c.jpg https://live.staticflickr.com/4357/35572790714_63735a4fb9_c.jpg https://live.staticflickr.com/4393/36271100741_09e8c319ed_c.jpg https://live.staticflickr.com/4405...
by Dr Tony Balls
17 Jun 2022, 13:32
Forum: Boutique Stompboxes dissected...
Topic: Rift Amplification - EL34 [traced]
Replies: 38
Views: 47167

Re: Rift Amplification - EL34 [traced]

Build circuit point to point in 3D as to fit a vacuum tube Make sure all external connections (in, out, pots) are on one side Make a mold using an EL34 Suspend circuit inside mold and pour clear epoxy resin Mount epoxied circuit to tube base, connections soldered to tube pins. Get Hammond box, moun...
by Dr Tony Balls
24 Feb 2022, 21:08
Forum: Pedal Debugging & Troubleshooting Support
Topic: Linear vs Switch Mode Power Supply & Hum
Replies: 1
Views: 489

Linear vs Switch Mode Power Supply & Hum

I've built a tube driver in the BK Butler / Baja / Madbean Archibald vein and just noticed something that i've not come across before. I'm getting hum (120Hz) when using linear power supplies such as a Boss PSA-120T, but i'm not getting any hum when using a switch-mode power supply such as the Boss ...
by Dr Tony Balls
28 Dec 2021, 16:15
Forum: Pedal Debugging & Troubleshooting Support
Topic: Troubleshooting help - BK/Baja Tube Drive content
Replies: 12
Views: 1741

Re: Troubleshooting help - BK/Baja Tube Drive content

Thanks for the information, but unfortunately this didnt seem to do the trick (unless i'm now missing something different). I reconfigured the charge pump to provide +/- 12V and got the same results. U It's not about negative voltage reference, but a cathode resistor/cap combo which you've butchere...
by Dr Tony Balls
20 Dec 2021, 15:17
Forum: Pedal Debugging & Troubleshooting Support
Topic: Troubleshooting help - BK/Baja Tube Drive content
Replies: 12
Views: 1741

Re: Troubleshooting help - BK/Baja Tube Drive content

This is a misconception, you cannot replace this split power supply with a single 24 VDC supply, which results in completely different operating points of the tube stages. The negative voltage together with the cathode resistor forms a so called pseudo constant current source. This means that half ...