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

monika park cfo at synthcube.com
Tue Jun 20 02:07:35 CEST 2023

We’ve offered the OML version for many years with positive feedback from customers. Less direct experience with the Alfa version (so far) but we make no judgement between the two since both seem fit for specific purposes.

Sent from my iPhone

On Jun 19, 2023, at 6:24 PM, Tom Wiltshire <tom at electricdruid.net> wrote:

 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:


And here's Alfa's:


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<https://shop.re-303.com/product/ba662-clone/>


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:


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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