Pro Audio Design Forum

I am not comfortable sharing details of what I am doing, since it is in a commercial design so proprietary.

Kinda thought that's what you'd say.

So what are you going to do JR?

Yes. VCA, SPI interface for control, stored wiper (gain) setting, slewing between steps with an external C to eliminate zipping. Add an analog Ec for realtime control. The VCA always wakes up with the last gain setting and moves between steps with a smooth linear dB slope.

VCAs. With a NVM DPOT on Ec.

Holy shit.

Good work Doug. WIll I be hearing the on "Undercurrents?"

Thanks for posting this John. I know that in your application that the ADI LOGDACs might be too expensive. They also zip but IIRC are monotonic in their gain steps. Have you ever tried them and is ADI still in production of these? I remember them being used in the Studer 820 and MCI/Sony APR-24.

In your second try using the NLC you mention a 10K resistor. Where was that in the circuit?

Thank you for joining us!

Interesting EE Times Article:

https://www.planetanalog.com/author.asp?doc_id=528114

Oops, wrong thread!

I think it fits here fine. One is for phones, one for transformers. Need to start one for driving cable.

It's very adaptable circuit...

Roger - Thanks. I may need to clarify something for our readers. The circuit Roger is refering to is not actually posted in this thread but is the headphone amplifier with external driver transistors. For the sake of clarity it is here: https://www.ka-electronics.com/Headphone_Amp/Headphone_Amp_1646...