Be away from powerpoints
I'm going camping for a few days and then straight up to Woodford for almost a week. My girlfriend and I will be away from powerpoints for almost the entire time but need our phones to work during...
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Voice Coil as sensor for control.
This simple circuit allows for control of the speaker cone. The power amplifier operates as a current amplifier. Without regulation caused the current amp a strong peak in the resonant frequency of the...
View ArticleReading 27c513 with 27C512 eprom reader
Hi all I need to read a 27C513 chip, archive, and burn a copy but my Willem Eprom programmer doesn't list 27C513 as one of the chips it will program. The card that takes 27C513 also works with 27C512...
View ArticleTransformer energy conservation
If I have a 100VA transformer with say 0-50AC and 0-50 AV (i.e. dual) secondaries and I use just one of the secondaries (keeping the other unconnected), is ALL of the 100VA available in the 1 secondary...
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TI TPA6120A2 OpAmp Breakout Board
Hello All, I've set up a small business to sell small hobby audio gear. The first thing I'm selling is an assembled breakout board for the Texas Instruments TPA6120A2 OpAmp. Which is almost impossible...
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FS: DACT CT-2 50k quad (used)
Selling a quad gang DACT 50k attenuator. Salvaged this from a friend's project that came in for repairs. I have tested it and it checks out as it should. Sells new for 392$ on Parts Connexion. 210$...
View ArticlePioneer P700BT
I have an issue of a pop through the sub, turn on, turn off, hitting the mute button, whenever output is cut from the deck. I wired an amp up that caused my pico fuse to open on the deck. I fixed that...
View ArticleLM3875 + Broskie Cathode Follower. (PICS)
HI folks. Ive started a thread RE this build in the chip amp section. Using BCF and 6H1N valves Hope it might be useful?
View Articlespeakers for leak tl12+
I'm thinking of getting some speakers for my leak tl12+ amps. which ones should I be looking to buy ?. I don't want to spend too much though. any recommendations welcome, thanks.
View ArticleBuild thread for ES9023 + JG Buffer boards (betatest)
I opened this thread for further discussion about my I2S input ES9023 + JG Filter Buffer boards. Of course any general discussion about the detailed application (Cs, Rs, regs,...) of the ES9023 DAC...
View ArticleLow gain in Heathkit SA-2 phonostage
I am fixing up an old Heathkit SA-2 for a friend, and I have got the thing working quite well. The problem I can't seem to sort out is that the phono (mag phono) input does not have sufficient gain....
View ArticleRe: Tri-Amp Distortion
Hi everyone I recently set up a tri-amp system with Behringer Super-X Pro CX3400 crossover. My current gears are as follows: CD/DVD Player: Toshiba SD-900E Active Crossover: Behringer CX3400 Power...
View Articlelarger AC motors and shielding issues? Animated cabinet
I'm working on an animated guitar cabinet- think Leslie, that'll be close enough for now- and I'm wondering about noise and shielding and such. This is being designed from the ground up. There's a nice...
View Articlelm1875 psu issues
Hello, making my first chip amp that I am actually spending money on :p. Well, as a newbie, of course I have some issues. Disclaimer, I do apologize if this has been covered. I didn't find anything by...
View ArticleNeed some help with 2 way crossover
Hi I know it´s a simple question for You folks, but my old year school math is a bit rusty. Supose I have a 8 Ohm woofer and a 8 ohm tweeter or Compression unit If I connect them to a passive crossover...
View ArticleFilament Transformer Question ?
I have a toroid 12V transformer (no CT). I plan to power TWO 6.3V AC filaments (preamp or driver tubes) in series. How does this compare to a 12VCT transformer with one 6V for each filament ?
View ArticleThe ideal dimension
I have a pair of speaker already bridged removed from an old samsung TV. As they look good for me, I like to build a wood box to re-use it. As I am more carpenter than an electronician. I like to know...
View ArticleJust joined today
My name is Jeff White and I live in Michigan, USA. I am an avid music lover and have been enjoying audio for going on 30 years. I have upgraded gear more times than I care to remember (or admit to my...
View ArticleDEQX HDP3
DEQX HDP3 Previous top of the line model. Recently superceded. Unit- excellent condition. Manual- poor condition (well thumbed, tears, notes e.t.c). Calibration kit not included (i.e. measurement mic)....
View ArticleDIY audio spectrum kits.
Hey all! Does anyone know of any DIY audio spectrum kits off the net? I'm wanting one for an amp I'm building. I've been looking around with little luck, I found one but it costs $225 which i think is...
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