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Hello all, I don't normally post here much but @thet is there a specific reason why the transformer primary needs to use virtual ground versus "original recipe" ground at pin 1? I can guess we're able

I have put the board in a body for a more stable test situation. Though the cover is off of course. With a 100pF cap across the 1G resistor to simulate a capsule, I now have a very high virtual

How are you measuring it? What value are you measuring? What voltage are you measuring on pins 2, 3 and 6 of the 1641? Wrong assumption. That confirms it's not the origin of the problem.

If anyone sees a theoretical issue with my schem I'd be grateful for any enlightenment. If the schem is OK then I guess I'll find it through regular troubleshooting procedures. Actually I'm getting

How far off-center is the virtual ground voltage? I would try disconnecting stuff: 1) remove the opamp and measure voltages (all voltages) 2) restore the opamp, measure again 3) disconnect the

and here's the link direct to the schematic, which is what I meant to post: https://halfshavedyaks.xyz/pcb/images/schems/OPATX-sch.jpg

On my opamp mic with a transformer, my virtual ground is unbalanced, it is closer to actual ground than to V+ I thought it might be DC running through the transformer primary, I've tried with the

Thanks Jules, glad I checked.

Hi Damian, Unfortunately, selling items on the forum is not allowed. You can mention sites you find or sources of components etc. but not selling your own stuff. Best Regards, Jules Ryckebusch

Hi all, I have a few mics I'm thinking of selling, is it allowed on the forum? Just said I'd ask in case of falling foul of moderation or etiquette, thanks, Damian

On reflection, no I wouldn't omit C6; opamps like caps (C6, C7) right at the IC.

I think I would omit C9 and C6. Ground is the reference to AC-couple to to the virtual ground; C9 is coupling to the +v rail, which I wouldn't want. And given the presence of C18, C10 is arguably

You may want to make R3 and R4 adjustable, if only to compensate the difference in sensitivity. You may find that the best noise rejection does not coincide with perfect balance. Apart from that, I

Here's my latest design for the aviation mic based on the feedback. Things I wanted to fix: * Actually be able to control gain properly * Flat(ish) frequency response despite being a diff * Prevent

I own two Chinese dynamic capsule supposedly for SM57 replacement. I will try to find the brand when I get back home.

Mic Sharf, maybe do you think about Xtuga? I owned a long time ago an Audio Technica kit that was worth the money. Maybe Shure PGA56 can do the job, I never tried them. Best regards, Aymeric LORION

The following items have been added to the Files area of the [email protected] group. * /Dynamic cartridges data recap report 1a small font .pdf (

Yes! Parallel!!!!! Best Regards, Jules Ryckebusch

I don't think there's any serious problem with the reference being a virual ground, as long as it's correctly decoupled to ground with a capacitor.

try this OPA "Alice" Tom Microphone - Share Project - PCBWay Gesendet: Freitag, 25. April 2025 um 12:43 Von: "Muninn via groups.io" <ninmiso@...> An: