[sdiy] Ultrarough draft of my hot-rodding of the Music Easel ring mod

[Aaron Lanterman]

On Nov 27, 2008, at 4:21 AM, Simon Brouwer wrote:

> Aaron Lanterman schreef:
>
>> (Note the 5532s are really supposed to be 4558s, which are the  
>> closest
>> thing I found to the out-of-production and weirdly-pinouted RC4136
>> used in the original easel;
>
> Only the weird pinout would be the obstacle then:
> http://focus.ti.com/docs/prod/folders/print/rc4136.html
>
> According to TI's data sheet (of 2002) the extended temperature  
> variants
> "RM4136 and RV4136 are obsolete and are no longer supplied" but  
> apparently
> RC4136 is still in full production.

Interesting! I didn't know that.

Hmmm... it's probably best though for me to use a standard modern quad  
pinout. It might be interesting to build it with IC sockets and swap  
various op amps in and out and measure the current draw and listen to  
any sonic differences.

- Aaron