Using LM-324 because I have them here and they work extremely well in 
the application.

         

        ---- Original Message ----
        From: "peter bunge" <[email protected]>
        Sent: 4/1/2021 10:25:42 AM
        To: [email protected]
        Subject: X-IMail-SPAM-Connection Re: [neonixie-l] LM-324 op amp
         

        Why are you using a 324 Op Amp? Older OpAmps are asking for problems 
with instability and common mode input range as well as output swing limits.
        
                I suggest you look at something like the TLV2371 series that is 
available as single, dual, and quad. Inputs and outputs are rail to rail. 
        
                Yes, connect as unity gain buffer. You don't want extra 
resistors.
        
                If you want retro design and a challenge use a uA702 and good 
luck with getting it stable.



        
                On Thu, Apr 1, 2021 at 10:06 AM David Forbes 
<[email protected]> wrote:
        
                
                        
                                Bill,
                        
                                That's not a good idea. It is likely to 
oscillate. See my other reply.
                        
                                 
                        
                                
                                
                                
                                        
                                                On Thu, Apr 1, 2021, 6:37 AM 
Bill van Dijk <[email protected]> wrote:
                                        
                                                Ty the unused inputs to ground 
with a 10K resistor, float the unused outputs.
                                                
                                                Bill
                                
                        
                
                
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