Search found 506 matches: servo
Searched query: servo
- Sat Dec 16, 2023 10:40 am
- Forum: Pro Audio Design
- Topic: True Phantom® from PREMA Semiconductor
- Replies: 3
- Views: 9410
True Phantom® from PREMA Semiconductor
... Condenser Microphone Distortion" PREMA IC PR2301 TruePhantom® is a high impedance phantom power supply for condenser microphones with a servo-regulated output voltage of 48V. This decreases the load for your microphone considerably. Compared with standard phantom supply circuits, TruePhantom® ...
- Sun Jul 09, 2023 4:28 pm
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 389803
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
... at the article. He is floating the frontend and then uses a 220n cap to avoid the level shifting. The floating frontend is a SSM2017 with a DC servo (470k/470n) sampling the output and then injecting correction ("balanced", by also inverting the servo output) into the input through ...
- Thu Jun 22, 2023 11:59 am
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 389803
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
... higher SPLs is likely high in even-order. I've seen the same effect. For the input-capacitorless preamp I've pretty much decided to pursue a dual servo system the first of which would minimize gross offset at the input from current imbalance. The input itself would be the sample point and the ...
- Wed May 03, 2023 7:49 am
- Forum: Pro Audio Design
- Topic: ZTX851 and ZTX1053A Noise Measurements and Comparisons
- Replies: 2
- Views: 14333
ZTX851 and ZTX1053A Noise Measurements and Comparisons
... ranging from 1KΩ to 10KΩ/leg. To permit direct comparison I used the MC preamp's 5.5 mA Ic and 1KΩ (499Ω/leg) bias network. For these test the servo was disabled extending the preamp response to DC. The gain is 61.5 dB. The test circuit is found here: https://proaudiodesignforum.com/images/png/Flat_Balanced_Input_Moving_Coil_Phono_Preamp_ZTX851_FLIP_22_Schematic.png ...
- Tue Mar 28, 2023 3:57 pm
- Forum: Pro Audio Design
- Topic: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
- Replies: 142
- Views: 389803
Re: New: A Direct-Coupled Input-Capacitorless Active Mic Preamp
... preamp with high collector current and input transistor Hfe around 130-200. I estimate the current noise density to be about 4pA√Hz. The preamp's servo is turned of to extend response to DC. The Focusrite 2i2 is flat to around 2Hz or so and it has a noise corner around 4-5 Hz. The preamp's noise ...
- Tue Feb 07, 2023 5:05 am
- Forum: Pro Audio Design
- Topic: Questions about THAT1512 in mic pre
- Replies: 5
- Views: 16342
Re: Questions about THAT1512 in mic pre
... mic lines. To keep it simple I would eliminate the inductors both at the input and Rg lines and also use a capacitor in the Rgain line without any servos. Since you're using a pot for gain control having Cg keeps DC out of the wiper better than a servo. C1 in Joe's preamp (180pF) or C25 on the ...
- Mon Feb 06, 2023 2:34 pm
- Forum: Pro Audio Design
- Topic: Questions about THAT1512 in mic pre
- Replies: 5
- Views: 16342
Questions about THAT1512 in mic pre
... to an unbalanced TRS output via three different low-cut filters as shown in the diagram below. I've read through Wayne's thread about the improved servo and I prefer this one over the floating version that flies along with phantom power. However, I am not sure why I would need to servo the output ...
- Thu Apr 21, 2022 9:27 am
- Forum: Pro Audio Design
- Topic: That1580 mini mixer
- Replies: 105
- Views: 363692
Re: That1580 mini mixer
It looks like you'd have to servo into the input bases since one emitter has Rg in series.
- Wed Apr 20, 2022 2:24 pm
- Forum: Pro Audio Design
- Topic: That1580 mini mixer
- Replies: 105
- Views: 363692
Re: That1580 mini mixer
Yes I looked at the 626x a few times. Most recently I didn't like the low-ish gain, no servo and, worse distortion figures on the preamp than the 1580. Thinking about it now, I could fit 2 470uF 10v cg's on a preamp card since I would only need 2 or 3 cards, 39/34 ...
- Tue Apr 19, 2022 6:31 am
- Forum: Pro Audio Design
- Topic: That1580 mini mixer
- Replies: 105
- Views: 363692
Re: That1580 mini mixer
... sheet says it swings to +-4v. So everything following I was thinking max swing is 8v p/p. Do I need ac coupling - C11 and C12, or does the servo on the 5171 eliminate enough dc at the output of the 1580? Figure 12 does not show any caps. https://statics.cirrus.com/pubs/appNote/an241-1.pdf ...