yet another 808 kick clone PCB set

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falafelbiels
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yet another 808 kick clone PCB set

Post by falafelbiels » Wed Jul 16, 2014 7:47 am

Hi guys,

Some of you may have noticed my 808 snare clone PCB sets which have been doing alright. To follow up on that, there are now kicks as well.
they go BOOOOOMMMmmmmm.

I have ordered a very small batch today so some will soon be available again at €25,- per PCB set (+p&p).
this is the place that you can find the BOM for it and stuff like that.

Image
Image


the Beast has been working on some panels for these too.

Image

Got these in today

Image

And there's the hihat as well.
Click

these and the snares and hihats are now available from Synthcube:

klik
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Last edited by falafelbiels on Fri Oct 17, 2014 5:46 am, edited 5 times in total.

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raveboyy
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Post by raveboyy » Wed Jul 16, 2014 10:59 am

Hi, what schematic did you folow? ...if it is not a secret 8_)

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falafelbiels
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Post by falafelbiels » Wed Jul 16, 2014 12:46 pm

No secret. I started off from eric Archers good work. Then I added some circuitry for proper triggering and sequencing, namely some. Comparators and a logic gate.
Note the "go" button, important.

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raveboyy
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Post by raveboyy » Wed Jul 16, 2014 10:53 pm

I added some circuitry for proper triggering and sequencing
Do you mean the =diode,cap,resistor combo= from his web too? ..or something similar?
Note the "go" button, important.
Is the button just connected to +ve supply close to the trigger input?

I`m going to build this from his schematic too...just the legs` numbers on his pots are quite confusing :)

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falafelbiels
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Post by falafelbiels » Thu Jul 17, 2014 2:31 am

raveboyy


This is what is on the panelcomponentboard (plus the pots of course)

Image

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falafelbiels
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Post by falafelbiels » Sat Jul 19, 2014 3:53 am

Little demo with the kick, snare and my very first and very grainy sounding hihat .

https://soundcloud.com/falafel-biels/ki ... -recording

https://soundcloud.com/falafel-biels/boom

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falafelbiels
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Post by falafelbiels » Thu Jul 24, 2014 4:01 am

Received some new board sets yesterday. Stocked for a while...

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falafelbiels
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Post by falafelbiels » Tue Jul 29, 2014 8:40 am

Received some panels from forummember julian today (The Beast)

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Post by euromorcego » Sat Aug 23, 2014 2:31 pm

are the pots linear, as for the snare?

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falafelbiels
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Post by falafelbiels » Sat Aug 23, 2014 2:32 pm

Yep all are linear.

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Post by euromorcego » Sat Aug 23, 2014 3:20 pm

ok, thanks! Just now got around to ordering part. Capacitors (other than electrolytic) are a mix of film box and the polyester mylar from Tayda. Is that correct? I am trying to go after the pictures (and BOM, of course), but it's sometimes hard to see.

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falafelbiels
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Post by falafelbiels » Sat Aug 23, 2014 7:52 pm

I have built a fair amount of these kicks and I believe that in this circuit it doesn't matter much what type capacitor you put in where. In the snare and hihat you may want to solder in some "greenies" in the filter and oscillator bits.
But also in those, anything will work.

Image

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falafelbiels
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Post by falafelbiels » Fri Oct 17, 2014 5:51 am

these and the snares and hihats are now available from Synthcube:

klik

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Post by duff » Sun Dec 21, 2014 10:06 am

I have just got round to wiring some panel components up to my pair of bass drums pcbs and have had a chance to test them out. Unfortunately they both seem to exhibit the same issue. Whilst I can dial in some boom using the decay and tune pots this is almost hidden by the sound of the trigger (or accent whether triggering or not) CV clicking away. The tone pot appears not to do anything either, or I can't tell because the trigger click drowns it out.

I can't see anything obviously wrong, the trannies appear to be in the right places, and I have swapped in a new 358 and new 072 but this made no difference.

It might be worth noting that the -ve rail on my PSU was playing up when I first tested the boards - could this have killed the trannies? Also I currently have nothing connected across the button, but I am assuming that won't matter.

Any ideas gratefully accepted.

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Post by duff » Sun Dec 21, 2014 4:01 pm

I have one of my snares up and running too now and I seem to have the same issue on that as well :hmm:

I get a click on the pulse on and the pulse off - I can hear this on both the trigger when the drums fires and the accent which obviously does not trigger the bass drum or snare sound.

The length of the drum envelope on both appears to be dependent on the pulse width - it that correct?

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falafelbiels
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Post by falafelbiels » Sun Dec 21, 2014 6:17 pm

Hard to say. You wired it to an alternative panel, right? Do you happen to have some good pictures of it?
Did you wire up the pushbutton?

The tone pot adds attack to the sound so it makes sense that if you mostly hear a click in the first place the effect isn't audible.

The -ve rail acting up may mean you have a shortcircuit going on.

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Post by duff » Mon Dec 22, 2014 8:08 am

The -ve rail was definitely the power supply. It was one I had built on really nasty cheap perfboard that had disintegrated and was shorting across the 7912.

I haven't got a button wired in yet, but I tried shorting across it on the snare pcb and got a lovely 808 snare sound with none of the dc thud I get when using the trigger so I guess that limits where I may have a problem.

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falafelbiels
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Post by falafelbiels » Mon Dec 22, 2014 8:39 am

The pushbuttons are diode gated with the trigger input. I hope that is of any help. The trouble should be in the frontpanelboard which is good, beacause it is pretty simple.
Have you seen the schematic of it?

Image

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falafelbiels
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Post by falafelbiels » Tue Dec 23, 2014 8:14 am

Oh shit, that accent in is NOT normalled to V+ Like the schematic says

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Post by duff » Tue Dec 23, 2014 5:20 pm

Thanks for the schematic - I had a quick check over what I have done and nothing jumped out as wrong. Unfortunately I am now banned from sdiy until the end of the festive season so an investigation will have to wait.

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Post by falafelbiels » Wed Dec 24, 2014 11:42 am

What's festive about it then?

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Post by duff » Fri Jan 23, 2015 1:04 am

Turns out all my CV thump issue were down to the fact I hadn't connected an earth to my jack board. :doh:

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falafelbiels
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Post by falafelbiels » Fri Jan 23, 2015 3:37 am

There you go...

:tu:

Works now eh?

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Post by acilator » Wed Apr 01, 2015 1:54 am

I finally got to build the 808 kick. It went well but when I put it in my rack and tried it out I found a problem.
Every time it's triggered it sounds different, longer/shorter decay and volume changes.. It's the same when I trigger it from a trigger or from the trigger button.

Anybody an idea what I did wrong or where is start to measure.

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Post by falafelbiels » Wed Apr 01, 2015 3:07 pm

Oh shit!

Does this also happen with a short decay setting?

I know that with overlapping notes on long decay settings it can get a bit wild. I suppose that that is why the original tr-808 didn't have rediculous long decay.

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