[sdiy] Op-amp to boost VC signal with +5V/GND?

[Stewart Pye]

Hi Mykolas,

You'd need a rail to rail I/O op amp, and even then you could run into 
problems when you get to the rails.

As you are using CMOS IC's and not TTL, you'd be best off running the 
whole circuit from +12V, then you could use a basic op amp like an 
LM358, and also have gate outputs up to 10V or more. All you'll have to 
do is change the reg to a 12V one and use a higher voltage plugpack.

Even then you'll only be able to handle positive CV's without a negative 
supply, but that shouldn't really be a problem...

Regards,
Stewart.


mikas wrote:
> Hi guys,
>
> My project is slowly moving forward.
> http://www.analogas.uzrasai.lt/tag/seq/ ( LT at the moment only, EN
> coming soon).
>
> 1. Could You recommend me an op-amp to boost VC signal with single
> +5V/GND power supply? I don't want to make PSU with +12V/gnd/-12V (or
> 15V) just for boosting VC signal. I've made simple +5V with 7805 to
> use with external +8V PSU. I want to keep it simple.
>
> http://www.analogas.uzrasai.lt/wp-content/uploads/2010/07/seq1.jpg
>
> Can I use TLC27? Or other recomendations. My local shops are a bit
> limited, ex: http://www.rcl.lt/index.php?id=2&lang=en&acc=show&fid=644
>
> 2. Also, can I drive GATE with two 40106 as shown in schematics? Idea
> taken from MFOS.
>
> Many thanks.
> Mykolas
>
>
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