Pro Audio Design Forum

Your defined Ro would need to compensate for deal that. I'm still marveling over the complete lack of grammar. Ok, it was early... There are a few more tricks that might be available. 2X 1646 in parallel provides a nice internal 12.5 Ohm build-out/current sense resistor. I would look at a possible ...

Two minor things to overcome using bare 1646s to drive HP:

1) There are internal build-outs of 25R/output. Your defined Ro would need to compensate for deal that.
2) Where do you return feedback?

There almost needs to be on Op Amp ahead of the 1646 with the 1646 only a unity gain power booster.

Using it as a rumble filter is cool. How did you do the decoders with THAT1246's? I've done it before and it requires some tricks since the internal resistors do not have equal value. It added stages so I chose an alternate method using 1240s and attenuating the 2L and 2R terms by 6 dB elsewhere. I'...

ricardo: My friend and previous co-worker Rosalfonso Bortoni wrote "Audio Amplifiers Principles, Characteristics, and Applications." His graduate work was with power amplifier output stages and current-driven speakers. As far as I know it has not been translated from Portugese. I think I m...

Yeah, I think the Delta-Omega was a negative OP impedance.

ricardo - I think a THAT1240/1246 could be used to measure the floating shunt's current.

Hmm. Let me think about where I saw something like this recently. I want to say it was an EDN or Electronic Design article or IFD.

What actaully was the Crown Delta/Omega?
We had those where I worked once.

I decided to try out an "equal mono power" version to distribute the mono energy equally between the Mid, and "Side" outputs. Mono (L+R) drives the headphone transducers in common mode. Difference (L-R) drives the headphone transducers differentially. The Side outputs operate di...

Cool John. Would you have a resource for an old manual for that product showing it to be prior art? The Freescale patent has a lot of claims that include the filters and ground detection. But it looks like from the patent that they may have convinced the examiner sum/difference drive was unique. It ...

I have often wondered about constant-current drive for phones. We used it driving spring reverb transducers at MicMix. WRT Ro some common values are 32 and 63 Ohms. I've seen ranges from 10-200 Ohms. There may be one model at 300R. AKG re-designed the "most-highest" AKG-240 which was 500-6...

JR's the expert but my vote would be to back-ground.