No because the 100uF connected to the top of the 10k makes that the DC supply voltage for the FET.David Root wrote:Since the 9K2 is in series with the 10K, shouldn't I be comparing the top of the 9K2 with the bottom of the 10K?
First Generation ODS #004 Just Wired Up
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martin manning
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Re: Some Progress
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David Root
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Re: First Generation ODS #004 Just Wired Up
OK, makes sense! Thanx again for your help Martin.
Edit: I checked my wiring and I had the top of the 9K2 connected to the 100uF cap, not the 10K, so I just removed the 9K2 and jumpered the cap to the top of the 10K. Now I have an 8K2 that measures 8K3 for Rs and I get Vcc=9.9V, Vd=4.9V and Vs=4.1V
So now I need to fix the FET jack issue, then on to tweaking the OD, it's a bit harsh for me as is, maybe needs snubbers.
Uodate: changed the funky OD entrance to 820K/100K divider as per TM's recommendation. Much more controllable and better matching with the clean mode. FODE doesn't drop the signal much at all.
Also added 270pF snubbers to V2. Big improvement but can get aggressive if you turn up the Drive pot.
Fixed the FET jack issue, I got the front and back contacts reversed on the left hand side, had signal wire to ground and vice versa. Switched the wires and works fine. My apologies to Switchcraft, they were not defective, I was.
Edit: I checked my wiring and I had the top of the 9K2 connected to the 100uF cap, not the 10K, so I just removed the 9K2 and jumpered the cap to the top of the 10K. Now I have an 8K2 that measures 8K3 for Rs and I get Vcc=9.9V, Vd=4.9V and Vs=4.1V
So now I need to fix the FET jack issue, then on to tweaking the OD, it's a bit harsh for me as is, maybe needs snubbers.
Uodate: changed the funky OD entrance to 820K/100K divider as per TM's recommendation. Much more controllable and better matching with the clean mode. FODE doesn't drop the signal much at all.
Also added 270pF snubbers to V2. Big improvement but can get aggressive if you turn up the Drive pot.
Fixed the FET jack issue, I got the front and back contacts reversed on the left hand side, had signal wire to ground and vice versa. Switched the wires and works fine. My apologies to Switchcraft, they were not defective, I was.