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Boss ODB-3 bass overdrive

Last post by Lani « Yesterday, 13:57
Posted in Pedal Debugging & Troubleshooting Support
Replies: 19
by Hosebass57 » 19 Oct 2020, 22:48 » in Pedal Debugging & Troubleshooting Support

Greetings

Re: Boss ODB-3 intermittent sound.

I have recently found in my collection of pedals, one of them.

The problem is that when I step on the pedal to turn it on, the sound is faded. It sounds like the effect is only kicking in very little. If I keep my foot down on the pedal, the sound Is perfect. I believe something is wrong in the switching circuit. I've tried looking for a schematic but haven't had any luck. Any insight would be helpful.
I'm using a Voodoo Labs ISO 5 power supply...

19 Replies

11767 Views

Last post by Lani
Yesterday, 13:57
Low voltage tube overdrive

Last post by Vitallka « 15 Mar 2025, 04:50
Posted in DIY Projects
Replies: 14
by Vitallka » 02 Mar 2022, 10:35 » in DIY Projects

Hi there. I am from Ukraine and I want to present you my project of low-voltage tube overdrive on a 6И1П (soviet analogue og ECH81).
Scheme:

Sound is recocrding on a blackberry q10 (tube overdrive - tube SE - 1x12 Seventy80):

14 Replies

5334 Views

Last post by Vitallka
15 Mar 2025, 04:50
Boss MZ-2 Digital Metalizer with dead chorus/doubler fnction

Last post by dhmusicnz « 15 Mar 2025, 04:49
Posted in Pedal Debugging & Troubleshooting Support
Replies: 3
by solewheelin » 24 Apr 2020, 06:54 » in Pedal Debugging & Troubleshooting Support

Hi i'm needing some help with this.
I bought an MZ-2 on reverb with the mode knob not working properly.
The MZ-2 is an analog pcb which is the drive circuit sandwiched to a digital pcb which is the chorus/doubler circuit.
The issue being the Mode knob stays in drive mode no matter where i set it. I poked every solder joint with a chopstick and could barely get a whisper of the chorus/doubler signal. I even flowed some solder to the obvious connections to the mode knob and checked the...

3 Replies

1857 Views

Last post by dhmusicnz
15 Mar 2025, 04:49
Colorsound - Wah+Fuzz+Swell [schematic]

Last post by carlsefni « 14 Mar 2025, 15:54
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 38
by MoreCowbell » 16 Jan 2008, 16:16 » in Vintage Stompbox Corner ( ... - 1975)
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cs swell fuzz 1.jpeg

cs wah swell 2.jpeg cs wah swell 3.jpeg cs swell wah 5.jpeg cs wah swell 5.jpeg
38 Replies

35487 Views

Last post by carlsefni
14 Mar 2025, 15:54
Digitech PDS 20/20

Last post by Stevenrb718 « 13 Mar 2025, 21:42
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 2
by Stevenrb718 » 05 Jan 2024, 16:15 » in Modern Stompbox Effects (1975 - ...)

I have a PDS 20/20 that is driving me crazy. The delay effect timing is right, but the effect on the note itself flanges up and down like a wave. It's like rocking a pitch shifter back and forth. I have replaced the bad caps, checked all the transistors, and swapped around several of the ICs with no change. The voltage regulator is also tested fine. I have no idea where to look next.

2 Replies

3024 Views

Last post by Stevenrb718
13 Mar 2025, 21:42
THAT Simple Mic Preamp

Last post by soulsonic « 12 Mar 2025, 08:52
Posted in DIY Projects
Replies: 2
by soulsonic » 09 Mar 2025, 13:16 » in DIY Projects

Here is a bare bones mic preamp project I designed based on the application notes published by THAT Corp for their THAT 1512 mic preamp chip. This was done at the behest of someone on the GroupDIY forum who was looking for a THAT chip board layout suitable for home etching, but I'm posting it here first for folks to check out and get a first look.

This design includes an option to have a switch for -6dB Line Mode, which takes advantage of a unique feature of the THAT 1512. If the switch is...

2 Replies

568 Views

Last post by soulsonic
12 Mar 2025, 08:52
Foxx - Select-a-Fuzz [schematic]

Last post by nightraven « 10 Mar 2025, 19:10
Posted in Vintage Stompbox Corner ( ... - 1975)
Replies: 12
by digi2t » 22 May 2015, 01:10 » in Vintage Stompbox Corner ( ... - 1975)

Seeing as there are only two trace side gut shots, and no one is willing to post components, I took some time to look at this.

The pictures seem clear enough to make out what might be a resistor, or a cap. Cap polarities are fairly clear as well. Even a diode symbol can be made out. Wire connections to the board seem to be bigger solder blobs. Transistor E and C letters are there. So looking at, I get this;

Two things that pop out at me, are the resistor/cap in series between B and C...

12 Replies

16808 Views

Last post by nightraven
10 Mar 2025, 19:10
AMT Electronics - S1 Legend series [schematic]

Last post by tuck « 10 Mar 2025, 11:28
Posted in Modern Stompbox Effects (1975 - ...)
Replies: 634
by Ice-9 » 20 Jan 2012, 13:35 » in Modern Stompbox Effects (1975 - ...)
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Last night I sold my MXR badass 78 distortion, so this morning put the money towards an AMT S1 legend series Soldano pedal/preamp ordered from Thomann (i'm sitting by the letter box waiting). I really want to have a look inside and work out what makes this pedal tick. If there is any info available already it would be good is someone can point me in the right direction please.

I know the designer behind it has had quite a bit to do and say on these and other forums. From the clips at the AMD...
634 Replies

344407 Views

Last post by tuck
10 Mar 2025, 11:28

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