Simmons Clap Trap

8-bit Digital Clap Trap

Until I've tested a few new sounds in this clapper this page are mostly quotes from multiple sources

Clap Trap mark I+II

The first Claptrap was analog and it was a Musicaid device, built approximately 1979/80, likely assembled by Dave Simmons himself, followed by the analog Simmons Claptrap (technically the same as the Musicaid but with a humanizer function and a slightly different case) and completed in 1984 by the digital version: the “Simmons Digital Claptrap”, one of Simmons’ most important “bread and butter” products.

Wolfgang's blog - Simmonsmuseum

Clap Trap

The Clap Trap has been designed to produce authentic and repeatable ensemble handclaps at your command - it can produce other sounds such as percussive crashes and bursts of noise to give a long decay to snare drums.

The instrument assembles its characteristic sound by controllably blending a digital recording of people clapping, stored in memory, with a general background crash of white noise. The recording is approximately 1.5 seconds long, however both the clap and noise components of the sound have individual controls governing pitch and decay time. A switchable "humanizer" allows a different part of the digital recording to be outputted each time the unit is triggered, giving a random, human feel.

With a variety of possible trigger sources including footswitch, drum mic, tape track and of course, the SDS6, the clap trap is a handy little instrument, ideal for adding percussive handclaps to your music.

Digital Clap Trap flyer 1984

Humaniser

Humanizer

In the normal mode the recording of the claps is re-started every time the Clap Trap is triggered, thus the claps always sound the same.

When the humanizer switch is depressed, a different part of the recording is outputted each time the Clap Trap is triggered. Thus the claps sounds different for each trigger.

Digital Clap Trap User Manual

Digital Clap Trap

Digital Clap Trap

Knobs

Digital Clap Trap knob

With precise lathe and molding these Cliff knobs doesn't come cheap. But more than 30 years down the road they still clean up nicely and looks almost like new. Sadly caps are often missing on these knobs.

Thanks to Ed Rose in USA who stock these parts it is possible to make Digital Clap Trap look nice again. You can reach Ed through his gmail account, the Simmons list on Yahoo or send a private message in the comment section here and we can set you in contact.

SDS V BassTwo page user manual

Architecture

A single LM13700 Dual OTA handles separate envelope decays for sample and noise source. LM324 op-amp are used throughout with the exception of a LM301 in the noise circuit.

Digital to analog converter in this unit is a DAC08EP which is identical to DAC0800 you find in other Simmons products from the time period. DAC addresses are set by LM556 Dual Timer and two CD4024 Binary Counters.

Eprom The DAC0800 are a direct replacement for the DAC-08.

PCB See more PCB pictures in the file list below


Prices

Early 2018 eBay auctions suggest the Digital Clap Trap are valued around 550US$ when it come with original box. Considered this is the least valuable of the three Simmons clappers buyers are probably looking for more than its musical functions.

Trigger Inputs

...to come

clap·trap

1 - contrived but foolish talk
2 - insincere and pretentious talk

- The Free Dictionary

Links

Synthjack has an Analog Clap Trap clone https://syntherjack.net/snapclap-the-only-handclap-you-need/


To view high resolution images, right click on image and select View image or Save image

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DAC0800_National.pdf
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