[sdiy] Roland SH-2 schematic IC identification

[rburnett at richieburnett.co.uk]

Maybe you can work out what's what by referring to the SH-09 service 
manual at the same site:

http://manuals.fdiskc.com/flat/Roland%20SH09%20Service%20Manual.pdf

They are very similar synths, so it's not too hard to figure out what 
the IC's do.  e.g.

BA662's are the OTAs used for the filter (x4) and the VCA (x1)
uA726 are the temperature controlled dual transistors used in the expo 
converters
DN819 is flip-flop frequency divider used to generate the sub oscillator 
waveform
TA7140 is power amplifier for headphone output
LF13741 is op-amp used in sample and hold amplifier for keyboard CV
TA7179 is the power supply regulator IC

Hope this helps,

-Richie,



On 2014-06-24 13:57, Jack Jackson wrote:
> Hi Guys,
> 
> I was just poring over the SH-2 schematics and noticed that although
> they list the ICs used, they don't actually identify them on the
> circuit diagrams or board layouts.
> 
> Any idea what's what?
> 
> http://manuals.fdiskc.com/flat/Roland%20SH-2%20Service%20Manual.pdf
> 
> Best,
> Jack 		 	   		
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