Nobels ODR-1 Reissue doesn't work - need help

[igor4444]

Hey guys, my Nobels ODR-1 Reissue doesn't work. Definitely no sound. The led is on, but no sound at all. Any ideia what happened?

[willienillie]

Measure and report DC voltages (relative to ground) of each pin of each active component, and also identify the component.

Post a schematic if you can find one.

[11-90-an]

Welcome to the forum...

Measure and report DC voltages (relative to ground) of each pin of each active component, and also identify the component.

Post a schematic if you can find one.

Yes please...

[ElectricDruid]

Just to confirm: The LED lights up, and switches on and off correctly, but you get no sound with either the pedal on or the pedal bypassed? Is that right?

Is there anything else that we should know about? Have the jacks been wobbly or intermittent? Was it plugged into some unknown power supply recently?

If there's really no sound in either position, that's either broken connection meaning no sound gets to the board (can't see anything cracked looking on your excellent photographs) or the FET switches have died. My bet is the second, and I suspect the 4007UBE, but without plenty more information and a schematic, that's not much more than a hunch based on several guesses at this stage.

[Steben]

[ElectricDruid]

Ok, that's interesting. There's a reasonable amount of stuff there that could kill the signal for both bypassed and effect modes: That initial buffer, that output buffer, C42, C43, plus the FET switching (which has a 'Remote' footswitch jack, a nice touch).

I'd still start by powering the board up and then testing pins 5 and 8 of the 4007UBE chip. If those pins don't switch between high and low when you press the button, you've got the problem. If they work fine, then we have to start doing something a bit more like serious fault-finding. But it's worth a quick check.

[ElectricDruid]

Incidentally, there's an excellent article on this pedal by the designer, about the design choices they made, and the minor changes that have been necessary over the years:

https://nobels.de/history-of-odr-1?lang=en

Worth a read even if you haven't got one of these kicking about.

[Steben]

Incidentally, there's an excellent article on this pedal by the designer, about the design choices they made, and the minor changes that have been necessary over the years:

https://nobels.de/history-of-odr-1?lang=en

Worth a read even if you haven't got one of these kicking about.

As a matter of fact: The combination of soft clippers in the opamp loop and hard clipper behind is not new in 1992 by Nobels...
It was used by Elektor distortion unit in 1986. It was explained then as a controller not to let the opamp clip. Interesting idea.

[ElectricDruid]

Yeah, you can take the "I'd never heard of anyone having done this before me" part at face value. They may well have never heard of anyone else doing that, but that doesn't mean it had never been done. Most decent ideas are arrived at many times by many different people.

[Ben N]

Loved the article! My ODR-1 clone (thanks, Kevin, for the pcb) is one of my favorite ODs, and a (more or less) permanent fixture on my board. That anyone mistakes it for a TS is proof that some people hear with their eyes, and not their ears.

[Steben]

Loved the article! My ODR-1 clone (thanks, Kevin, for the pcb) is one of my favorite ODs, and a (more or less) permanent fixture on my board. That anyone mistakes it for a TS is proof that some people hear with their eyes, and not their ears.

Their sleepy eyes, since the diodes to ground are not hidden.