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

Roman modular at go2.pl
Tue Jun 20 08:00:07 CEST 2023


Looks very much like LM13700 to me, so why bother?

Roman 

---- Użytkownik Tom Wiltshire napisał ----

>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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