[sdiy] BA662 (Was Re: SPV-355 -15V rail issue)

Tom Wiltshire tom at electricdruid.net
Tue Jun 20 00:13:52 CEST 2023


Interestingly, thre are a few minor differences between the reverse-engineered Open Music Labs schematic (which the Re-303 uses) and the Alfa clone. Some of the differences are obvious stuff, like diode-connected transistors being shown as diodes, for example, but not everything.

Here's the Open Music Labs version:

http://wiki.openmusiclabs.com/wiki/x0xb0x <http://wiki.openmusiclabs.com/wiki/x0xb0x>

And here's Alfa's:

https://www.alfarzpp.lv/eng/sc/AS662D.pdf



> On 19 Jun 2023, at 13:10, Todd Sines <sines_list at scale.la> wrote:
> 
> Din Sync make them for their RE-X0X series
> That link would be here 
> BA662 Clone – RE-303 Web Shop
> shop.re-303.com
> <favicon.ico>
>  <https://shop.re-303.com/product/ba662-clone/>BA662 Clone – RE-303 Web Shop <https://shop.re-303.com/product/ba662-clone/>
> shop.re-303.com <https://shop.re-303.com/product/ba662-clone/>	<favicon.ico> <https://shop.re-303.com/product/ba662-clone/>
> 
> Todd
> 
>> On Jun 19, 2023, at 4:39 AM, Tom Wiltshire <tom at electricdruid.net> wrote:
>> 
>> Yes, Alfa make a clone - or at least a chip with that number:
>> 
>> https://www.alfarzpp.lv/eng/sc/AS662D.pdf <https://www.alfarzpp.lv/eng/sc/AS662D.pdf>
>> 
>> 
>> 
>>> On 19 Jun 2023, at 04:41, Adam (synthDIY) <synthdiy at adambaby.com <mailto:synthdiy at adambaby.com>> wrote:
>>> 
>>> Actually, yes you're right, the Roland BA662 OTA that they used a lot around this time, both for VCAs and VCFs. I've sent you the schematic.
>>> 
>>> I think they've been cloned successfully in recent years

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