Informative simulation. It would be nice to have a "real" opamp simulation for OPA1612 and OPA1656 (and OPA2134?). That would be helpful for this sort of work.
I have attached the latest layout and schematic. Getting ready to order soon. Since this shrunk 10cm x 10cm board is only $2 to order I am hoping that it will allow many others to DIY. As a result I really would like to get the design and layout right. If anyone has a moment to look over it I would appreciate it. My hope is for first pass success and I would like the design/layout to be well done.
I have attached the latest layout and schematic. Getting ready to order soon. Since this shrunk 10cm x 10cm board is only $2 to order I am hoping that it will allow many others to DIY. As a result I really would like to get the design and layout right. If anyone has a moment to look over it I would appreciate it. My hope is for first pass success and I would like the design/layout to be well done.
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Ok, yes that is true. But for preamp use it could make sense.....maybe...
I think my headphones has a single mini-jack pr cup so in theory it would be possible to make it as 100% dual mono. This would require a wire from each cup and 2 x single jack connectors in Whammy? .....but I have never seen any done that and not very practical.
I think my headphones has a single mini-jack pr cup so in theory it would be possible to make it as 100% dual mono. This would require a wire from each cup and 2 x single jack connectors in Whammy? .....but I have never seen any done that and not very practical.
Well $2 gets you 5 boards at JLCPCB.
So perhaps later I can make a derivative which is a mono board. I would want to prove out the first (stereo) design before thinking about that.
Would need to think about the connectors, etc. I assume the potentiometer would be deleted and would be external? What would you want to see for the connectors?
Use a single opamp footprint? (More limiting.) Or a dual using only one side?
So perhaps later I can make a derivative which is a mono board. I would want to prove out the first (stereo) design before thinking about that.
Would need to think about the connectors, etc. I assume the potentiometer would be deleted and would be external? What would you want to see for the connectors?
Use a single opamp footprint? (More limiting.) Or a dual using only one side?
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At least one of the projects here on this site, offers builders the option to use either a single opamp (example: LT1122) OR a dual opamp (example: LM4562) just by plugging into different sockets. see photo
As you might already know, the LT1122 is not available in both single and dual; it's single only. And the LM4562 is not available as a single; it's dual only. With two sockets, a board can accommodate either of them.
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As you might already know, the LT1122 is not available in both single and dual; it's single only. And the LM4562 is not available as a single; it's dual only. With two sockets, a board can accommodate either of them.
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I'm 97% noob when it comes to amps so I'll wait for a working prototype. Otherwise the likelihood of smoke is also 97%.
No preference.
Attached are what should be the final version. I plan to order the PCB tomorrow after checking again later today and again tomorrow morning. If you see any issues please let me know!
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If one day the PCB layout was made to accommodate "single" op-amps could Waynes 2018 line stage be used as "op-amp(s)" if the feedback loop was opened (R16 lifted on linestage) so the Whammy global NFB loop was connected to the "lifted" R16 on linestage?
R16 goes to what would be the inverting input of the op-amp?
Then Whammy would be 2 x Wayne?
Wonder if anything of this could be understood.......
R16 goes to what would be the inverting input of the op-amp?
Then Whammy would be 2 x Wayne?
Wonder if anything of this could be understood.......
The boards were ordered this morning and it will take 3-4 weeks for them to arrive (airmail) and be tested. If they are ok the idea is that anyone can order them from JLCPCB website for $2 plus the shipping fee. It is an easy website to use. Just upload the gerber file .zip archive, use all defaults on the PCB options, add to card and checkout/pay.
