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Messages - madbean

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Global Annoucements / Re: Oct. Releases (instead of Sept)
« on: October 17, 2018, 11:51:02 AM »
Headtrip doc is up.

Tech Help - Projects Page / Re: UberTuber
« on: October 16, 2018, 01:03:37 PM »
T2 is a bit high but not too worrisome. T1 is a problem though. I start by increasing the plate resistor on that one from 100k to 150k. You could lower T2 by increasing its resistor to 120k. Your V+ and heater are spot on so it's just wrangling those plates in.

Maybe for the next batch I should put trimmers in place of resistors for the plates. I never really had a problem with my own set of tubes achieving proper bias but of course people are getting them from all over the place. So, it seems like an obvious improvement to the design.

Open Discussion / Do I need a Moog?
« on: October 15, 2018, 06:23:11 PM »
I really kind of want the Behringer Model D. It's not expensive and I have a keyboard controller. My buddy Graham has one and likes it. But, I also really kind of want a Subsequent 37. Because it is badass. But, also expensive. I like the SubPhatty, too. I think I just want something Moog because well, reasons. Also, I think I want to build some synths down the line but much later.

Global Annoucements / Re: Oct. Releases (instead of Sept)
« on: October 15, 2018, 06:19:50 PM »
So, on the Headtrip I've decided to include the SpinCAD file used to make the patches for the project. I'm really hoping people will take advantage of that to start exploring SpinCAD to program their own stuff. It's really pretty easy once you get the hang of it. That doc should be up tomorrow. I still plan on doing an introductory tutorial to SpinCAD before the end of the year. Things is pretty crazy ATM, though.

General Questions / Re: Tractor beam build
« on: October 15, 2018, 06:17:47 PM »
The chart is in the doc specifically for the switching board. Different VFE projects use different value Zener diodes on the switching board. In the case of the Tractor Beam, it's a 16v Zener. The chart is on page 7 of the Switching Board build doc. In reality, you could use a 12v, or 18v or none at all. It's only to prevent over-voltage getting to the circuit but if you are careful about always plugging in 9v then it's no big deal on the Tractor Beam.

Tech Help - Projects Page / Re: Moar IC voltages pins 4 and 8 swapped
« on: October 15, 2018, 04:48:37 PM »
Well it's a bit baffling how you could have 9v on the 1n5817 and not on pin8 of the IC since they are directly connected. Are you sure you haven't confused pins 4 and 8? If you look at the trace diagram in the build doc, pin8 is the one connected by the fat red trace and pin4 is the one that appears to have no connection (it's actually connected to the ground plane).

Global Annoucements / Re: Oct. Releases (instead of Sept)
« on: October 15, 2018, 02:54:25 PM »
Dreamtime doc is up. Hopefully I'll have one more doc up today and the rest tomorrow.

Tech Help - Projects Page / Re: Moar IC voltages pins 4 and 8 swapped
« on: October 15, 2018, 02:45:26 PM »
I am using a Schottky 1N5817G in place of a regular 1N5817 at D9. Would that make a difference?

None at all. What are your voltage readings on both sides of the 1N5817?

Tech Help - Projects Page / Re: Moar IC voltages pins 4 and 8 swapped
« on: October 15, 2018, 01:44:10 PM »
That's an unusual looking IC. Where is it from?

General Questions / Re: Beginning My First Madbean Builds!
« on: October 13, 2018, 06:00:55 PM »
These look great. I really like those green knobbies!

Open Discussion / Re: Who was the Prom Queen in August?
« on: October 13, 2018, 11:28:07 AM »
That's it. Two week timeout for you. 

Global Annoucements / Re: Oct. Releases (instead of Sept)
« on: October 12, 2018, 06:09:53 PM »
Where did you get these black copper boards I found some on Ebay. I would love to try this.

abcfab is the seller on eBay.

Open Discussion / Re: Car repair is poopy
« on: October 12, 2018, 03:18:39 AM »
Brian, really 85 degrees and 80% humidity. Pffff. You lived in Texas, címon man.


Oh I know. I've turned into a total wimp since I left Texas!

Open Discussion / Car repair is poopy
« on: October 11, 2018, 06:28:02 PM »
My dang Jeep failed emissions testing the other day. Showed two (of four) oxygen sensors being bad. I think: oh...I can do this myself! It doesn't look hard! You know what's hard? Crawling under your car for several hours trying to fish your hands and a socket wrench through impossibly small spaces when it's 85F and 80% humidity in dang October! And, only to find out you didn't fix the problem all the way and the car has to go to the shop after all. Because...really...I have so much free time to be doing that sort of stuff right now.

Looking forward to my next car job which is replacing the brakes and rotors. Compared to the O2 sensors, it seems like a cakewalk.

Global Annoucements / Re: Oct. Releases (instead of Sept)
« on: October 11, 2018, 08:33:02 AM »
Still behind but coming as soon as I can finish up.

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