Search found 569 matches

by emrr
Sun Apr 02, 2023 8:50 pm
Forum: Pro Audio Design
Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 142
Views: 353258

Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp

Adding additional resistance to represent source impedance shifts both curves upward but large differences remain with typical 150Ω source impedances. Do those shifted differences track with this plot, or is the effect increased? This looks like 12dB difference at 50Hz, 6dB at 100Hz. In the zone wh...
by emrr
Tue Dec 13, 2022 9:17 pm
Forum: Pro Audio Design
Topic: THAT4301 Analog Engine End of Life. THAT4305 adapter boards.
Replies: 8
Views: 19490

Re: THAT4301 Analog Engine End of Life. THAT4305 adapter boards.

The attack release changes are interesting. Looks like changing the RMS cap, and trimming the input resistor are both necessary if substituting in an existing build.
by emrr
Sun Dec 11, 2022 3:09 pm
Forum: The Peabody Lounge
Topic: Analog "POTS" Phone Service - US Copper Shutdown Imminent
Replies: 4
Views: 9551

Re: Analog "POTS" Phone Service - US Copper Shutdown Imminent

I don't know about ISDN, I would imagine they aren't taking orders. I haven't had a copper line in a dozen years or more.
by emrr
Tue Aug 30, 2022 1:22 pm
Forum: Pro Audio Design
Topic: concept: saturator unit - transformer
Replies: 3
Views: 10962

Re: concept: saturator unit - transformer

As an owner of a zillion varieties of transformers, I find entropy has a way of destroying this concept - too many people with too many disparate aesthetic interpretations! To make something universal, you'd need to decide on a median level handling range, provide both attenuation and gain before an...