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Topics - Marv Mod

#1
Tech Help - Projects Page / Aquaboy DX diodes help
April 06, 2015, 01:55:57 AM
Hi all,

I'm a perennial lurker on the board and read as much as I can prior and after builds to try and resolve any issues. But with the Aquaboy being complex I could do with a hand on the diode config.

I'm building with MN3005s and MN3101 cock. NE570 commander and VTL5C3 vactrol. 15v operation through a Road Rage supplied with 9v (LT1054 on board). I'm following the other instructions (sockets, jumpers and correct resistor values) considering these part choices.

Question: given the approach above do I omit all 3 diodes? From reading up it seems that I should.

Seems like I've read the build doc loads but just wanted to check!!

Many thanks for any pointers,
Jeremy
   
#2
I was looking over Lace's Doppelganger board and was thrown by the resistors that were in place of the jumpers noted in the build doc.

It then dawned on me that these were 0R / 0 ohm resistors.

Quick question: Why / when would you use these, and what's the difference over just using jumper wires?

Cheers,
Jeremy
#3
Open Discussion / Availability of Road Rage?
May 13, 2013, 04:12:26 AM
Afternoon all,

Just tried to order a Road Rage and when I get to check out my PayPal order says they are unavailable, despite being able to click the order button on the projects page. I guess they're sold out for the moment?

Brian, any idea when you'll have more in?

Cheers,
Jeremy
#4
Just finished and boxed the Double Flush. I'm very happy with the result but one thing is on my mind: the status LED flashes as it should in time with the pulse / speed setting, but it does this all the time. When I power the pedal (even without a jack plugged into the input) it flashes. And it flashes when in bypass - I thought it was meant to go solid on (or maybe off) in bypass?

Is this how it is meant to work?

Thanks for any thoughts,
Jeremy
#5
I'm struggling to find a 51pf cap at position C23 to finish my Collosalus with. I can get a 47pf and 56pf no problem - would these be acceptable alternatives? If so would one be more preferable over the other?

Any help would be greatly appreciated!
Many thanks,
Jeremy
#6
Hi guys, I'm struggling to find some 5kC pots. I'm thinking 5kBs would be ok as alternatives. Does anyone have any opinons on this? Would the linears be ok, or should I really try and get the reverse audios?

Any thoughts gratefully appreciated!
Cheers!
Jeremy
#7
Tech Help - Projects Page / 4n Capacitor for Mudbunny
November 02, 2011, 11:37:41 AM
Scouring the usual sources I can't find a 4n cap for use in the Violet Ram's Head Mudbunny project.

Any ideas where I can get one or any ideas on a substitute value?

By the way, I'm based in the UK.

Cheers,
Jeremy
#8
Open Discussion / Debugging basics
September 24, 2011, 10:26:50 AM
I'm still new to pedal building and I'm after some basic info on debugging, after a build issue.

I've built a Tonepad Small Clone chorus pedal. Then using Jacob's test rig, I rocked it before boxing it. Problem is, there's no chorusing sound at all. With the pedal on, all I hear is my clean, unaffected tone going through.

That makes me think of a couple of things. Is there a ground issue? Not sure, as the signal is getting through fine.
Next, it makes me think there's a parts issue? Probably, but if I have a dud part, will I still get full signal? I thought any dud part would kill the flow of signal? Maybe I'm wrong?

But am I also right in thinking that if you're getting signal, then there's probably not a soldering problem?

(For those familiar with this project, I've wound the trim pot up and down its range, with no joy).

So my question is, if I'm getting signal through the pedal when on, but no effect, what's likely to be the problem? I know it's cheeky asking for help on a non Madbean project, but I'm curious as to what's happened - I guess this problem could be applied to any pedal build.

Any thoughts would be greatly appreciated! And please correct me if any of the assumptions I've made above are wrong!

Cheers,
Jeremy
#9
Open Discussion / Press n Peel madness!
August 09, 2011, 07:18:40 AM
Hi guys, I'm looking for some guidance on Press n Peel Blue as I'm not having much luck. My steps are as per instructions:
Cut copper clad to size. Sand edges and de-burr. Clean with Scotchpad then wipe clean with alcohol to remove any grey gunk.
Preheat iron, lay PnP on the copper, lay iron on top and press for a good while until the PnP has adhered. Then I go over the board gently so that the traces on the PnP come up black, suggesting they have adhered to the board. When I reckon I've covered everything, I cool the board and peel the PnP off to reveal the results. Time spent about 5 mins.
As you can see from the results below, I'm not having great success. The smudges could suggest the iron is too hot and the toner has melted, but then the centres seem to have set fairly well. Also some remnants of blue PnP top paper stuck to the copper might also suggest too hot. But then on the Sunking board, entire traces have not set properly. Gah! I've set my iron on 2 (it has 3 settings) which is the acrylic / wool setting (I can't gague temperature to get to the optimum 275-300F) which seems to be about right, having checked other forums. My copper clad is approx 1.8mm thick total. The printer is an HP mono set to normal.
Any tips or any suggestions most welcome. I've screwed up 4 boards already and would like to get this nailed!!
Cheers, Jeremy

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#10
Tech Help - Projects Page / 2N3565 for LaVache
July 28, 2011, 06:44:56 AM
Hi there! I'm getting ready to build the LaVache for my second build but have a query about how to orient the 2N3565 correctly. The one I've got has no flattened edge. I've attached a couple of pics if anyone can lend a helping hand? I'm not sure who the manufacturer is so I can get a data sheet - their logo is like two 'C' shapes intertwined to make what looks like an 'S' (see second pic).
I could go ahead and wire it up then reverse it if it doesn't work but I'm worried about blowing anything in the circuit.
Any help would be greatly appreciated!
Cheers, Jeremy

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#11
Tech Help - Projects Page / Egodriver IC voltages
June 27, 2011, 01:49:39 AM
Hi guys, I built myself an Egodriver this weekend from one of Brian's boards (v4) and I'm really pleased with the results. Worked first time and the sound is good to my ears.

Looking around the tech forum it seems the general voltages across the IC are 0v on pin 4, 9v on pin 8 and about 4.5v across the rest. Mine tally with this (I'm using a TL082CN on a 8.6v power input) but I've got 2.7v on pin 3. Is this an expected / acceptable voltage? As I say, I'm happy with the sound, but just curious as to this reading.

Cheers for any help or thoughts,
Jeremy