[sdiy] Best AVAILABLE OTA for building new designs?

[Roman Sowa]

Sadly, the LM13700 is still the best option. Cheaper by a magnitude than 
anything else. And easily available in large quantities. Last time I 
checked TI had around 200k in stock. If only it was made in nicer 
package, like for example WQFN, SOT23-16 or at least TSSOP. But no, they 
need to promote large SOIC like it's 1990.

Making discrete OTA with dual transistors might be tempting, but will be 
more expensive and I'm not sure if it's possible to make it smaller than 
space taken by LM13700 in SOIC.

Roman


W dniu 2024-08-08 o 20:08, Dan Snazelle via Synth-diy pisze:
> imagine someone asked you to make some new synth modules.
> then imagine that the last time you did so in any quantity above one---  
> it was 2017.
> 
> 
> I am trying to get a handle on what the parts landscape is like now for 
> cost-effective CV control. Back in 2017 the lm13700 was really the only 
> available OTA . I was just starting to work with the ssm2164 at the time 
> but never used it extensively.
> 
> In the interim I have built synth circuits but only in quantities of one 
> where cost was no object and I was able to rely on my own extensive 
> parts supply.
> 
> 
> So my question is this-- if I am thinking about design for 
> manufacturing—what do you think the best option is?
> 
> Has anyone tried the quad ALFA OTA? Is it even readily available? Same 
> for the new SSM2040​.
> 
> OR would you just use the 2164 instead?
> OR would you just try to make discrete OTAS out of say the  BCM856DS 
> //BCM847BS
> 
> thanks for any and all opinions on this.
> 
> 
> 
> 
> 
> 
> 
> 
> 
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