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strategy
Joined: Jan 03, 2009 Posts: 87 Location: portland, oregon
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Posted: Mon Feb 20, 2012 12:03 am Post subject:
amdek/boss HC-2 clap - layout? |
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I have seen the schematic for this on electro-music and in other locations on the net, but not pcb layouts. I'm not skilled in doing layouts, has anyone done one...? If so can you share? thanks in advance.
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Tue Feb 21, 2012 1:41 am Post subject:
Re: amdek/boss HC-2 clap - layout? |
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strategy wrote: | I have seen the schematic for this on electro-music and in other locations on the net, but not pcb layouts. I'm not skilled in doing layouts, has anyone done one...? If so you share? thanks in advance.
strategy |
The Boss/Amdek HC is not that great, I wouldn't recommend building one. It's just not as full sounding as the classic Roland clap sound, it's also very high pitched. You should build the clap from the Boss Dr110 or 808. There's definitely layouts around for the 808 clap, some of them here in this forum, but the ones I've seen need extra circuitry to work as a stand alone.
I have the Boss HC, I could probably scan the PCB at some point |
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strategy
Joined: Jan 03, 2009 Posts: 87 Location: portland, oregon
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Posted: Fri Feb 24, 2012 11:10 pm Post subject:
Re: amdek/boss HC-2 clap - layout? |
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[There's definitely layouts around for the 808 clap, some of them here in this forum, but the ones I've seen need extra circuitry to work as a stand alone.
I have the Boss HC, I could probably scan the PCB at some point[/quote]
I've downloaded several, it would appear they don't include the necessary noise section. I have access to a PCB that includes several 808 modules (maybe it is the older Microlarge project? not sure) but was wondering whether there was a standalone option...
will keep checking around...
Strategy _________________ --------
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Clack
Joined: Aug 08, 2005 Posts: 438 Location: Walthamstow - london
Audio files: 5
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Posted: Sun Feb 26, 2012 5:00 am Post subject:
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The HC2 is pretty much the same as all the other Roland claps. Sound differences are probably to do with single supply problems and different component values. The schematic out there does include noise , it uses a CD4006 shift register. The schematic that is full of errors so reverse engineering or just using one from the drum machines should be easier. Take note it uses the ba662 so you will need to substitute it with a 6110 or 13700 _________________ Clacktronics.co.uk |
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StephenGiles
Joined: Apr 17, 2006 Posts: 507 Location: England
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sun Feb 26, 2012 10:03 pm Post subject:
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What I was referring to by "missing" circuitry from the 808 drum layouts is the sort of trigger conditioning components necessary to make them work outside of the application they were designed for. I had assembled a few indivdual 808 drums, but I couldn't get them to trigger with any kind of normal gate/trigger. Other people were reporting the same thing. They need a specific kind of pulse-- maybe 1ms, and they also need an accent voltage. There's alot written about under the related topics. I was too fancy free to bother with figuring it out at the time... |
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Sun Feb 26, 2012 11:44 pm Post subject:
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So, i got inspired to start messing around with my HC2 again. i had previously performed the modifications recommended in this E&MM article-- which definitely helped. But I felt like there's still something wrong with this clap sound. Anyway, i disconnected one of the resistors, R7, that I had earlier changed. I think it's part of the pulse repetition timing. Whatever it was, when I disconnected it, it took out the high pitched clickety-clak sound that was bothering me. Now it sounds like a thick 'clud' clap. I can still hear the multiple triggering sound, but it's darker now; sounds the way it should now-- really great.
I put it through a band pass, and sharp digital delay. It sounds just like a Martin Hannett production.
I don't know if maybe there was something wrong with my HC2 to begin with, because as long as I've had it, the two tone controls, 'Dry' and 'Hall' do extremely close to nothing. I can hardly believe they'd put it on the shelf like that.
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umschmitt
Joined: Jun 29, 2011 Posts: 189 Location: brrlin
Audio files: 11
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Posted: Mon Feb 27, 2012 9:34 am Post subject:
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Quote: | 'Dry' and 'Hall' do extremely close to nothing. |
I was about to post something moderately interesting about the trimpot in the HC-2. I remembered I had dealt with it to reduce the level, thus letting more 'hall' through in comparison. Before posting I wanted to check it and the trim changed nothing but the level - no 'hall' at all… mmm… then I changed the battery (7.18V) for a newer one (8 something) and hooray, 'hall' ! And the trimpot acts as expected at first. With a wallwart (well over 9V i fear) I could get lots of that 'hall' thing. Conclusion : voltage matters. Still moderately interesting, but perhaps a bit more.
Oh and the 'dry' pot has a noticeable if not radical effect on my unit… _________________ ::U::N::S::C::H::N::E::L::L:: |
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strategy
Joined: Jan 03, 2009 Posts: 87 Location: portland, oregon
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Posted: Tue Feb 28, 2012 12:05 am Post subject:
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does that E&MM article include a PnP layout of some sort?
ericcoleridge wrote: | So, i got inspired to start messing around with my HC2 again. i had previously performed the modifications recommended in this E&MM article-- which definitely helped. But I felt like there's still something wrong with this clap sound. Anyway, i disconnected one of the resistors, R7, that I had earlier changed. I think it's part of the pulse repetition timing. Whatever it was, when I disconnected it, it took out the high pitched clickety-clak sound that was bothering me. Now it sounds like a thick 'clud' clap. I can still hear the multiple triggering sound, but it's darker now; sounds the way it should now-- really great.
I put it through a band pass, and sharp digital delay. It sounds just like a Martin Hannett production.
I don't know if maybe there was something wrong with my HC2 to begin with, because as long as I've had it, the two tone controls, 'Dry' and 'Hall' do extremely close to nothing. I can hardly believe they'd put it on the shelf like that.
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Tue Feb 28, 2012 4:42 am Post subject:
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umschmitt wrote: | Quote: | 'Dry' and 'Hall' do extremely close to nothing. |
Oh and the 'dry' pot has a noticeable if not radical effect on my unit… |
DRY is too small. Try 1M. It controls the Q of that bandpass filter. A mod to try would be to make the resistor to ground (can't read what the schematic says,) at that op amp's input variable for the filter's center freq.
Another thing to try is to make HALL a pot that balances between the two audio paths. _________________ Revenge is a dish best served with a fork... to the eye |
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ericcoleridge
Joined: Jan 16, 2007 Posts: 889 Location: NYC
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Posted: Tue Feb 28, 2012 9:27 am Post subject:
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I'm into trying these mods out, I'll report what I find. I'm starting to really like this clap-- it's starting to do what I had always intended it to. But, it could be even more useful with a little bit more control. I don't need or want too much control on a 'drum', but a little variation would be good.
richardc64 wrote: | umschmitt wrote: |
Oh and the 'dry' pot has a noticeable if not radical effect on my unit… |
DRY is too small. Try 1M. It controls the Q of that bandpass filter. |
I did already get some variation on the Dry control by implementing the mods discussed in the attached article. I'll definitely give the 1M a try though, as it could still use more range. I'll report back.
Any other thoughts of the Hall control? Although i can see the usefulness in having a balance control-- I think what the Hall control was intended to do would be most useful here. I think it was effectively like a decay control-- but it doesn't add to, or attentuate the decay on mine at all.
richardc64 wrote: |
A mod to try would be to make the resistor to ground (can't read what the schematic says,) at that op amp's input variable for the filter's center freq. |
You're referring to R40-- 100K to ground--on leg 5 of IC3?
Here's an extra large image of the schematic, if you please.
richardc64 wrote: |
Another thing to try is to make HALL a pot that balances between the two audio paths. |
The two sources being a pulse cluster and filtered noise? |
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richardc64
Joined: Jun 01, 2006 Posts: 679 Location: NYC
Audio files: 26
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Posted: Tue Feb 28, 2012 12:05 pm Post subject:
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ericcoleridge wrote: |
richardc64 wrote: |
A mod to try would be to make the resistor to ground (can't read what the schematic says,) at that op amp's input variable for the filter's center freq. |
You're referring to R40-- 100K to ground--on leg 5 of IC3? |
No, R57 at the 2 caps around 1/2 IC7, the noise filter. A 100k pot in parallel with that resistor could raise the filter freq. Replacing R57 with 1k in series with a 50k pot could raise or lower the filter freq.
Quote: | Here's an extra large image of the schematic, if you please. |
Oh my! That's real easy for these ol' eyeballs! Thanks!
Quote: | richardc64 wrote: |
Another thing to try is to make HALL a pot that balances between the two audio paths. |
The two sources being a pulse cluster and filtered noise? |
Um, they're both filtered noise. The "bottom" path is the cluster; the top is delayed (I think,) and is slightly low pass filtered by C22 so that it sounds a little muffled compared to the cluster.
I think HALL is supposed to control how prominent the fake echo is. You could try decreasing R31 or increasing R48 to give IC3 more gain.
I attach 3 samples of that filter, with slightly different values, acting on white noise. While only one sounds close to a hand clap -- without cluster or "echo" -- they should provide some idea what that filter can do. Input was ONLY noise.
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bpf_decay_1.mp3 |
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1084 Time(s) |
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bpf_decay_2.mp3 |
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closed_hh2.mp3 |
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1044 Time(s) |
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