Search found 4758 matches

by mediatechnology
Mon Dec 31, 2007 8:19 pm
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 307990

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

Happy New Years everyone! I decided to do some higher level measurements into various loads. The following measurements do not take into account the external generator distortion which has been posted earlier. At 7.6 Vrms into 270 ohms, 213 mW, 1 KHz THD reads 0.0021%. At 1.4 Vrms into 30 ohms, 65 m...
by mediatechnology
Fri Dec 21, 2007 9:44 am
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 307990

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

Some pictures: https://www.ka-electronics.com/Headphone_Amp/Proto_Front.JPG The heatsinks make nice hand warmers with dissipation of a little over 2W each at idle. With an efficiency of perhaps 2.5% I don't think I'll go for an "Energy Star" rating. Not shown on my original schematic are the 22 uF b...
by mediatechnology
Mon Dec 17, 2007 6:07 pm
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 307990

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp

I finally had a chance to finish the Vectorboard and run a few quick tests with RMAA. My power supply connections and load returns could be a little better (clip leads) but here's the test results I got: http://www.ka-electronics.com/Headphone_Amp/Output_30R.htm Here's the summary updated 12/20: htt...
by mediatechnology
Mon Dec 10, 2007 9:41 pm
Forum: Test, Measurement and Repair
Topic: Visual Analyser
Replies: 0
Views: 7846

Visual Analyser

I really like this Windows Tool. It can do a lot of things RMAA can't. It's free.

http://www.sillanumsoft.org/prod01.htm
by mediatechnology
Sun Dec 09, 2007 3:21 pm
Forum: Document
Topic: "Sam Electronic Circuits" Datasheet Collection
Replies: 0
Views: 7611

"Sam Electronic Circuits" Datasheet Collection

I found an interesting site, "Sam Electronic Circuits," which has a link to Sam's datasheets. It's a very nice collection of basic parts.

http://users.otenet.gr/~athsam/database.htm
by mediatechnology
Thu Dec 06, 2007 2:47 pm
Forum: The Peabody Lounge
Topic: My Future Studio in progress
Replies: 7
Views: 18442

Re: My Future Studio in progress

Nice Adam!

I'm almost as envious of your floors as I am the gear! We're on concrete here (mostly) while we debate acid-stained floors or Oak.

Does the lunch box rattle?

Thanks for posting the pics.
by mediatechnology
Wed Dec 05, 2007 9:41 am
Forum: Pro Audio Design
Topic: Using the THAT1646 As A Transistor Pre-Driver/Headphone Amp
Replies: 80
Views: 307990

Re: Using the THAT1646 As A Transistor Pre-Driver/Headphone

Hello everyone - I wanted to post a couple of updates. I think I would like my build of this project to include a polarity switch and I've posted one using the THAT1240 here in this forum. I discussed at Headwize the use of the AD823 FET as a buffer for the pot/stepped attenuator. The question arose...
by mediatechnology
Sun Dec 02, 2007 3:04 pm
Forum: Pro Audio Design
Topic: A Precision Polarity (Phase) Inverter Using the THAT1240
Replies: 0
Views: 9477

A Precision Polarity (Phase) Inverter Using the THAT1240

Here's another installment in the THAT1240 circuit collection. It's a precision polarity inverter that is a variation of the Graeme, Jung et al "phase flippers." What makes this one unique is the use of the THAT1240s precision matched internal resistors for gain setting. This assures dB accurate inv...
by mediatechnology
Sun Nov 25, 2007 10:35 am
Forum: Pro Audio Design
Topic: A Discussion About True Power Summing for Stereo Compressors
Replies: 65
Views: 111678

A Discussion About True Power Summing for Stereo Compressors

This was originally published by me in the Prodigy-Pro forum. The Pico Compressor Stereo Edition will be using a detection method called "True Power Summing." I thought it would be a good idea to re-visit the subject as it is one of the key design elements of the Stereo Pico Compressor and is a buil...
by mediatechnology
Wed Nov 21, 2007 3:43 pm
Forum: Pro Audio Design
Topic: Old: A Direct-Coupled Input-Capacitorless Active Mic Preamp
Replies: 212
Views: 349871

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

I wanted to let everyone know that I haven't forgotten this project and I just found what I think to be the "perfect" gain switch for this preamp and others: The GoldPoint Mini-V Custom. https://www.ka-electronics.com/DC_Preamp/GoldPoint_Mini-V_Custom.jpg http://www.goldpt.com/prices.html This unit ...