[sdiy] Analogue hardware simulations in LTspice

Richie Burnett rburnett at richieburnett.co.uk
Thu Oct 3 15:20:15 CEST 2019

For anyone interested in simulating analogue hardware, I've put the LTspice 
schematics for three bits of classic hardware on my website for download 


They are:

"808bd.asc" - models TR-808 kick drum synthesis circuit
"808cb.asc" - models TR-808 cowbell synthesis circuit
"303vcf.asc" - models TB-303 ladder filter sweep on saw-tooth oscillator 
with full resonance

You can download LTspice from Analog Devices / Linear Technologies website. 
It has the option to read & write to a WAV file, which is used here so that 
you can play back the resulting audio in your favourite wave editor, look at 
the spectrum, sample it, whatever...  You can also "circuit bend" the 
schematic, mess with component values, etc, and listen to what influence it 
has on the sound.  (and of course you can put voltage and current "probes" 
on the schematic to look at the waveforms at the various different nodes in 



PS. These LTspice files are provided as is.  No support or guarantee of 
correctness is implied.  Use as you wish.

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