Mismatched Bias Voltage in my Adcom GFA5500 Power Amp
I picked up an Adcom GFA5500 power amp recently. The amp ran barely warm (a few degrees above ambient). So I checked the bias voltage and I had 0.5mV on the left channel and 8mV on the other. The...
View ArticleRecommendation for a crossover choke
hi I need two 0.47mH chokes. They need to be aircore and decently low DCR. I have a small budget. Any recommendation? for your information, my crossover is: For the Tweeter the resistors are 4R7 in...
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Finishing my Audio Rack. Many Pix
Here are pix of the rack. I should have it done by the end of the week. Here is the stack of wood I got from a machine shop some time ago These are the bottom two shelves These are the top two shelves....
View ArticleNew Here -Would Like to Build
Hello, I am new to the audio amp building hobby. I have some high voltage experience in the RF category, so Im familiar with high voltages. Your help would be appreciated. I purchased two matching...
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Christmas Project - Audio Analyser
Here is my Christmas project: audio analyzer, still under construction. All sources come from Project 136 I hope I'm ready for the new year. regards and mery christmas Olaf Attached Images...
View ArticleQ on Boolean search
Hi, I enter this string in the "Advanced Search" window: "SMPS" AND "EMI" AND "filter" In the results, the forum software shows: "SMPS" OR "EMI" OR "filter" with a large number of results. How do I get...
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JL Audio 300/4 Low Audio Output Troubleshooting Tip
Repaired a JL Audio 300/4 Ver1 series with very low audio output on all 4 channels. After some troubleshooting and voltage measurements found pin 3 of U600 on the daughter board had no voltage on it....
View ArticleDc to Dc converter
Hi to all i try to creat IOR dc to dc converter that was converting 12 VDC to + - 35 VDC in this smps the FREQ is 50khz duty cycle was 50% mosfet is IRF6648 IC is IR2085 the core was ZP42915TC from...
View ArticleTannoy HPD 385 Crossover problem
Hi I have a sound in my tweeter of HPD385 coming for sure from the crossover, cause if i lay the crossover on soft ground, no problem, but mounted on the enclosure a little kind of scratching sound...
View ArticleLet's discuss studio monitors :D
Hi and merry christmas to all :hohoho: I m trying to learn about speaker designing , and understanding studio monitors , IMO studio monitors are wayyy overpriced , most of them (low and mid price...
View ArticleWanted: DEQ2496 v2 DSP board
I'm looking for a v2 DSP board from a faulty/dead/bricked Behringer DEQ2496. Will consider entire unit if you have one to sell. Thanks, Mark
View ArticleLCR RIAA Phono with DHTs
Hi! I finished a phonotage with LCR EQ and all thoriated tungsten directly heated triodes. Sounds amazing! A DHT lovers dream come true :D Details on my blog. VinylSavor: Listening to the all DHT...
View ArticleReported attack site?
I just logged into this site this morning and my browser is giving me a " Reported Attack Site" Warning, this place get compromised ? Message below; Safe Browsing Diagnostic page for diyaudio.com What...
View ArticleBest DIY dipole speakers?
What would be the best DIY dipole speakers you have ever heard? I'm interested on building some OB speakers, and the clear purpose is to get better sound quality than with current Magneplanars. I'm...
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diyaudio.com attacker ?
firefox alert diyaudio.com attacker ? Attached Images attacker .png (33.2 KB)
View ArticlePairs of esistors in opposite directions
Hello, I am just about to start building this amplifier. The circuit calls for using pairs of resistors in opposite polarities (I we could call it polarity being a resistor), from what I've read that...
View ArticleLabtec LCS-2424 Stand Alone Sub Hack Attempt
Hi all! First post! I used to have a complete Labtec LCS-2424 3-pc setup, but my daughter lost the the 2 sats, so Im sitting here looking at the sub, and that stupid jack in the back, looks like...
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calculate the transfer function
in this circuit i considered the gain of the op.amp to be equal to 1, so v1=vout, then i calculated vs using the voltage divider rule which gives: vs= v1*(R8/(R8+((R2*(R7+R10))/(R2+R7+R10)))) then i...
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Marantz 7 phono help needed
I am a member of diyaudio for a few years now. This is my first post: Thanks a lot for this great forum. It is a joy to know such things exist. My problem here - I had played around a little with a...
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