It would be cool to see you tear down and investigate a m^d professor simble drive. I believe it uses identical topology to the zen drive, but it sounds a little different, a bit thicker and chewier. Maybe also smoother and can get quite clean at low drive settings. Of course it also has goop. There was speculation that it used the mosfets as slightly differently, but I don't know. It could just be down to a couple of capacitor or resistor values.
Love these teardowns. You're my favorite gear channel, I really wish people would talk more about the circuits and I love that you really get in there.
Hi Joe, just a quick comment here. I suspect most if not all folks may believe that the MOSFETs in the Zendrive, Mosferatur, and Fulltone's Fulldrive/Bassdrive pedals are actively being used and conducting in the circuit. Actually, the MOSFET channel is not being utilized at all in these circuits! All MOSFETs have an inherent parasitic zener diode in reverse to the D-S path/channel, which means they have a forward diode in the S-D path/direction. What this means is that this internal diode of the MOSFET is doing the clipping/conducting, not the MOSFET D-S channel. It certainly makes for a good marketing scheme though.
Isn't that what the other diode is actually for? To prevent current from flowing in the reverse direction, and thus actually use the mosfet junction? I could be wrong..
If you look at the drawing you put up at around 5:49 and focus in on Q1, you will notice that the MOSFET is oriented S-D from left to right. If you look at the spec sheet for the 2N7000 you will notice that the parasitic zener diode is drawn in the symbol, and it is oriented A-K across the MOSFET S-D. This puts the zener diode in forward bias and in series with diodes D2 & D3. Therefore, the MOSFET's internal zener is simply being used as a forward-biased diode in series with D2 & D3.The same for Q2 and D4. The MOSFET channel can not conduct because its V(g-s) can not reach Vgs(ON), as the voltage is being clamped by the other clipping leg. The forward-biased zener in the 2N7000 does have a "loose and spongy" turn-on though, and perhaps why it is appealing in this application.@@xenod1066
@@graybenchelec after they walked in the bar, they discussed their job at the automotive plant. They all decided to quit. When asked why, they said, "when designing a car that enveloped our personality, we failed to make a sellable car. It had problems going in reverse."
It would be cool to see you tear down and investigate a m^d professor simble drive.
I believe it uses identical topology to the zen drive, but it sounds a little different, a bit thicker and chewier. Maybe also smoother and can get quite clean at low drive settings.
Of course it also has goop.
There was speculation that it used the mosfets as slightly differently, but I don't know.
It could just be down to a couple of capacitor or resistor values.
Love these teardowns. You're my favorite gear channel, I really wish people would talk more about the circuits and I love that you really get in there.
Thank you!
I look forward to your "what's inside" videos all the time. It's always a treat.
Thank you!
Hi Joe, just a quick comment here. I suspect most if not all folks may believe that the MOSFETs in the Zendrive, Mosferatur, and Fulltone's Fulldrive/Bassdrive pedals are actively being used and conducting in the circuit. Actually, the MOSFET channel is not being utilized at all in these circuits! All MOSFETs have an inherent parasitic zener diode in reverse to the D-S path/channel, which means they have a forward diode in the S-D path/direction. What this means is that this internal diode of the MOSFET is doing the clipping/conducting, not the MOSFET D-S channel. It certainly makes for a good marketing scheme though.
Isn't that what the other diode is actually for? To prevent current from flowing in the reverse direction, and thus actually use the mosfet junction?
I could be wrong..
If you look at the drawing you put up at around 5:49 and focus in on Q1, you will notice that the MOSFET is oriented S-D from left to right. If you look at the spec sheet for the 2N7000 you will notice that the parasitic zener diode is drawn in the symbol, and it is oriented A-K across the MOSFET S-D. This puts the zener diode in forward bias and in series with diodes D2 & D3. Therefore, the MOSFET's internal zener is simply being used as a forward-biased diode in series with D2 & D3.The same for Q2 and D4. The MOSFET channel can not conduct because its V(g-s) can not reach Vgs(ON), as the voltage is being clamped by the other clipping leg. The forward-biased zener in the 2N7000 does have a "loose and spongy" turn-on though, and perhaps why it is appealing in this application.@@xenod1066
Very cool. I didn't realize the Mosferatu was a precursor to the Zen Drive.
Agreed, I thought it was the other way around!
Awesome! Always excited for your videos. Could you do a build with components you have from scratch on perf
You might enjoy this! czcams.com/video/r_GZJcrnnHM/video.html
Hi Joe! Great video on one of Sonny Landreth's favorite pedals!
Love the teardown videos! Lovepedal does make a version of the Mosferatu with surface mount chips.
You're right, I think they did at one point. But no longer (at least it's not on the website).
So, a Schottky, a MOSFET body diode, and a germanium diode enter a feedback loop. Sounds like a beginning of a bad electronics dad joke.
I tried coming up with a punchline but I've got nothing. Hopefully someone will come along and rectify this situation...
@@graybenchelec after they walked in the bar, they discussed their job at the automotive plant. They all decided to quit. When asked why, they said, "when designing a car that enveloped our personality, we failed to make a sellable car. It had problems going in reverse."
Goop and sanding the op amps. Sigh!
First comment :)