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 Forum index » DIY Hardware and Software
Boss HC-2 Hand Clap Pedal Schematic?
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Fri Feb 13, 2009 11:48 am    Post subject: Boss HC-2 Hand Clap Pedal Schematic? Reply with quote  Mark this post and the followings unread

This is a pretty cool little Hand Clap device that I've had for a while--however, it suffers one major drawback-- there's no way to vary the pitch of the clap sound. To me, it's pitched a bit high, I like really low slowed down sounding claps.

So, i'd like to figure out where (if?) I could insert a variable resistor to give me a little pitch range. But I can't find a (free)schematic for this thing.

Does anyone know this device and/or have a schematic for it?
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211



Joined: Jul 18, 2006
Posts: 50
Location: Marseille - France

PostPosted: Fri Feb 13, 2009 3:31 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi ericcoleridge,

Sorry don't have these schematics, but this pedal is well known because it use the BA662 I searched when I built my 303 clone.

I think, but can't be 100% affirmative, that's the same circuit as the 808 who use this OTA too. I built a TR808 clap clone, and the tune mod is very simple.

As you said, You should find the noise source connected to BA662 input, and search for a resistor/capacitors Twin-T network who filter the noise sound, and replace the resistor by a pot to have a variable filtering.

You'll had to find the same R333 resistor than in these schematics and replace it for a 22K (Log?) pot.

(edit : perhaps you could scan both sides of the pcb ?)

Posted Image, might have been reduced in size. Click Image to view fullscreen.
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Sat Feb 14, 2009 12:23 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks, I'll take a look at it again. I have this 808 schematic already, but I wasn't sure how close it would be to the HC-2.

I'll try to scan/photo the PCB and post.
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andrewF



Joined: Dec 29, 2006
Posts: 1176
Location: australia
Audio files: 4

PostPosted: Sat Feb 14, 2009 6:21 am    Post subject: Reply with quote  Mark this post and the followings unread

it seems this is the diy kit version of the Boss HC-2
http://filters.muziq.be/model/amdek/hck100
at least the controls look the same.

can't remember where i found this...one of those 3am schematic trawls Confused


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211



Joined: Jul 18, 2006
Posts: 50
Location: Marseille - France

PostPosted: Sat Feb 14, 2009 10:11 am    Post subject: Reply with quote  Mark this post and the followings unread

Cool andrew ! If hc2 use the same component values, the cutoff frequency of the bandpass filter next to the noise generator is about 970-1700 hz depending of dry setting

Eric if you feel the dry setting cut too high, you may change the 2 caps values to shift down the cutoff frequency.

Does the dry setting actually act as a pitch knob ?
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StephenGiles



Joined: Apr 17, 2006
Posts: 502
Location: England

PostPosted: Sat Feb 14, 2009 11:29 am    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
it seems this is the diy kit version of the Boss HC-2
http://filters.muziq.be/model/amdek/hck100
at least the controls look the same.

can't remember where i found this...one of those 3am schematic trawls Confused


Many thanks, I've been looking for that for years, where did you find it as the text is rather small for tired eyes.
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Sat Feb 14, 2009 1:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

andrewF wrote:
it seems this is the diy kit version of the Boss HC-2
http://filters.muziq.be/model/amdek/hck100
at least the controls look the same.


Awesome, thanks. This does look the same, control-wise, to the HC-2. This is helpful.
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Sat Feb 14, 2009 1:27 pm    Post subject: Reply with quote  Mark this post and the followings unread

211 wrote:

Eric if you feel the dry setting cut too high, you may change the 2 caps values to shift down the cutoff frequency.


Thanks, I definitely give this a try. But, do you think there is a way to get a variable pitch?

Edit:
I now see on the Amdek document where is says changing these caps will increase the "Dry" range. Great! This is the best forum ever.


211 wrote:

Does the dry setting actually act as a pitch knob ?


Yes, now that you mention it. It's so very slight that I hadn't even noticed it as such. The "Hall" effect knob is also extremely subtle. But, despite having very little range, this is a really nice sounding clap; Very similar to an 808 clap sound.
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andrewF



Joined: Dec 29, 2006
Posts: 1176
Location: australia
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PostPosted: Sat Feb 14, 2009 4:47 pm    Post subject: Reply with quote  Mark this post and the followings unread

StephenGiles wrote:

Many thanks, I've been looking for that for years, where did you find it as the text is rather small for tired eyes.


Hi Stephen
you should be able to get it in the original A4 size or zoom in, its a large file, maybe download it and view it in an image viewer/Photoshop.

No idea where it came from but I suspect from one of the Japanese SynthDIY websites......thanks to whoever posted it originally.
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synth_ollie



Joined: Sep 11, 2006
Posts: 149
Location: sweden

PostPosted: Mon Feb 16, 2009 4:19 pm    Post subject: Reply with quote  Mark this post and the followings unread

the amdek is exactly the same as the boss clapper, the amdek was sold as a diy-kit

I made the e&mm scan and posted it to matrixsynth some years ago,
not very high resolution, but if anyone needs that I can make a better scan....

cheers

OLLIE
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ericcoleridge



Joined: Jan 16, 2007
Posts: 889
Location: NYC

PostPosted: Mon Feb 16, 2009 4:26 pm    Post subject: Reply with quote  Mark this post and the followings unread

synth_ollie wrote:
the amdek is exactly the same as the boss clapper, the amdek was sold as a diy-kit


Thanks, this is good to know.

synth_ollie wrote:

I made the e&mm scan and posted it to matrixsynth some years ago,
not very high resolution, but if anyone needs that I can make a better scan....


Cool, thanks for posting this scan; It's been very helpful.
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StephenGiles



Joined: Apr 17, 2006
Posts: 502
Location: England

PostPosted: Tue Feb 17, 2009 3:06 am    Post subject: Reply with quote  Mark this post and the followings unread

ericcoleridge wrote:
synth_ollie wrote:
the amdek is exactly the same as the boss clapper, the amdek was sold as a diy-kit


Thanks, this is good to know.

synth_ollie wrote:

I made the e&mm scan and posted it to matrixsynth some years ago,
not very high resolution, but if anyone needs that I can make a better scan....


Cool, thanks for posting this scan; It's been very helpful.


I would be very grateful for a higher resolution scan - many thanks. I found a photocopy of the E &MM page with that circuit but it has faded considerably over the years.
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fabreeze



Joined: Mar 13, 2006
Posts: 9
Location: Olympia, WA

PostPosted: Sat Aug 08, 2009 9:11 pm    Post subject: HI-RES SCHEMATIC?
Subject description: HI-RES???
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Hi, is there any chance you could post that HI-RES SCAN of the HAND CLAPPER schematic? Those part values are terribly hard to read. Also, do you have the Partslist? Thanks in advance.
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synth_ollie



Joined: Sep 11, 2006
Posts: 149
Location: sweden

PostPosted: Mon Oct 05, 2009 12:54 am    Post subject: Reply with quote  Mark this post and the followings unread

a better scan (c:


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StephenGiles



Joined: Apr 17, 2006
Posts: 502
Location: England

PostPosted: Tue Oct 06, 2009 1:05 pm    Post subject: Reply with quote  Mark this post and the followings unread

Many thanks
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pinkjimiphoton



Joined: Feb 23, 2012
Posts: 7
Location: team america world police land

PostPosted: Wed Aug 22, 2012 4:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

sorry to bump a zombie, but any chance one of you kind souls could shoot me a couple gut shots of this beast?

i had one given to me last nite, but it's been modded somewhat and dissassembled, the input jack is gone, and it looks like most of the power jack wiring has been disconnected....poorly.

a pic to see what goes where would be awesome!

thanks guys
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umschmitt



Joined: Jun 29, 2011
Posts: 188
Location: brrlin
Audio files: 11

PostPosted: Fri Aug 24, 2012 2:11 am    Post subject: Reply with quote  Mark this post and the followings unread

My pleasure (sorry I don't own a proper camera). Just ask if you need more pics !
Speaking of zombies, I congratulate for this crazy Gretsch pedal reviving odyssey ! Has been fun to follow, and what an achievement !


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HC-2 solderside.jpg



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pinkjimiphoton



Joined: Feb 23, 2012
Posts: 7
Location: team america world police land

PostPosted: Fri Aug 24, 2012 5:15 am    Post subject: Reply with quote  Mark this post and the followings unread

thank you!!1 it is now fixed and running!!!!

awesome!!!!

danke !!
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pinkjimiphoton



Joined: Feb 23, 2012
Posts: 7
Location: team america world police land

PostPosted: Fri Aug 24, 2012 10:50 am    Post subject: Reply with quote  Mark this post and the followings unread

oh, the ludwig pedal?

yah, thanks, that's been an awsome undertaking.

i still have to build my clone, may sell my original down the road...

naaaaaaaaaaaaah... Smile
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umschmitt



Joined: Jun 29, 2011
Posts: 188
Location: brrlin
Audio files: 11

PostPosted: Fri Aug 24, 2012 11:47 am    Post subject: Reply with quote  Mark this post and the followings unread

Arrgh ! You're right, it was Ludwig ! I had kept in mind 'the guitar pedal build by drum people' - as the reason for being ill-designed…
(and Gretsch make guitars too…)
Anyway, one has to (hand)clap to the wonderful job you lots did !

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pinkjimiphoton



Joined: Feb 23, 2012
Posts: 7
Location: team america world police land

PostPosted: Fri Aug 24, 2012 1:08 pm    Post subject: Reply with quote  Mark this post and the followings unread

thanks, you know the project is available at RG Keen's site, right?

geofex.com

it costs about 150. american to build one, and there's now a few running.

my eyes have gotten too bad to build it, so mrdigi2t is gonna probably build mine for me. Wink
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