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Here is my latest labor of love. This was going to be my fall contest entry, but there were holdups in the process, so it...


- firing up the circuit through my test rig for the first time. It didn't work!! I was terrified that I'd fried the metal can opamp. It takes so much heat to solder to turrets. I used a heat sink clamp, but still. It turned out (after MUCH studying the schematic and my layout) that there were two missing ground connections on the PCB, hence the jumpers on the bottom.

Awesome build.

I think the jumpers on the bottom continue to lend themselves to the "point-to-point" turret board type wiring.

Gives it a vintage/vibe sort of feel.

Even if you were to go into production with these boards I would definitely leave them there .

- making such a massive block of resin and wondering if I would get the amount right so it wouldn't overflow when I put the circuit into it. Also, wondering if I would get crazy amounts of air bubbles with no way to release them.

Gently tapping on the side of the mold always helps to bring bubbles to the surface.

With all this being said....

I want one those boards ! 


Dan

no love for me 

all that effort to produce a board mounted everything PCB, and someone wires everything. You crazy sausage.

Ha Ha !!
much love to you too !

After building your layout (the huuuuge one at FSB).....

This one was a treat....

Oh sure....I really really love offboard wiring <not> 

Hell yeah

It's kinda nice to see someone do such a wildly different layout. You can do exactly this with the hoooge etched version as well, only issue is board space.

Any ticking issues with all those wires? What's your overall impression?

as they say: quiet as a church mouse

I built one of the originals from the layout  at FSB:



sent it off to a buddy....and...never got it back

Finally got the time to build this one for myself.


Awesome pedal.

Love it - Thanks for the layouts and research alanp !

Thanks !

Don't know what else I'll use 'em for so into the QoB they go !

Dan

I googled and can't really come up with any definitive pictures of these dudes.

Got my QoB boards yesterday and was rummaging through the parts bin and found these.

Anyone know for positive that they're legit ?








Thanks, Dan

bumping for clarification

[was]

REMOVE, don't REDUCE the 27k. You made the pot smaller -- less resistance = faster.

But there's a limit also set by R9 -- increase that as well. I'd try 15k there and 4.7k for r7.

If that's still too fast, it's time to look into increasing C5-C7 to 2.2uF.

If you want to get fancy, you can also use a dual gang 50k pot for the maximum possible speed range. Use a 4.7k for R7, remove R8, and replace R9 with a 4.7K + the other side of the dual gang.

Yikes.

Okay.

Won't be going the dual pot route as this is in a 1590a and I don't want to go to all that hassle etc.

If I omit the 27k - should I leave the 1k5 in place or put it back to 2k2 ?

And - am I jumpering the connection that was the 27k ? (it looks to me like I would still need the connection ?)

I'll try the other mods and report back.

Thanks !

Dan

Hey All,

Can anyone give a hint as to slowing down a Magnavibe ?

It works great. Using an NSL opto and an ultrabright clear blue LED.

I did the resistor subs on the speed pot (2k2 dropped to 1k5 and 27k dropped to 10k).

Unfortunately - even at the slowest speed - it's still too fast.

I'm operating off this schemo:



Any help would be appreciated.

Thanks !

Dan

I'm in as well.

For any.....