Amplifier chassis question:
would this be a good or bad idea?
1.moving transformer into separate chassis, keeping away from the amplifier.
2.making the amp chassis from non metal material (aside from heat-sinks) to improve vibration control and remove electrical/magnetic interaction between chassis and circuitry
thanks,
Herman
would this be a good or bad idea?
1.moving transformer into separate chassis, keeping away from the amplifier.
2.making the amp chassis from non metal material (aside from heat-sinks) to improve vibration control and remove electrical/magnetic interaction between chassis and circuitry
thanks,
Herman
Could I use something like this : http://au.mouser.com/ProductDetail/...=sGAEpiMZZMvz8LftK4jergvKR6iZ/MetYUam7ntHZ5g= ?
Amplifier chassis question:
would this be a good or bad idea?
1.moving transformer into separate chassis, keeping away from the amplifier.
2.making the amp chassis from non metal material (aside from heat-sinks) to improve vibration control and remove electrical/magnetic interaction between chassis and circuitry
thanks,
Herman
#1 Always desirable but I doubt necessary with this build.
#2 Not really sure but I doubt necessary with this build
The store 4U chassis is more than adequate for this amplifier.
Could I use something like this : http://au.mouser.com/ProductDetail/...=sGAEpiMZZMvz8LftK4jergvKR6iZ/MetYUam7ntHZ5g= ?
Are you going to order 10,000 the minimum order? Desoldering is not that big a deal with soldering wick. Any connector of any type is a source of trouble one day. Solder.
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Are you going to order 10,000 the minimum order? Desoldering is not that big a deal with soldering wick. Any connector of any type is a source of trouble one day. Solder.
That was just an example. Plenty of low quantity options here to suit a range of hole sizes :
http://au.element14.com/webapp/wcs/...dex=1&showResults=true&pf=111854786,111854787
And you can also solder to them. In any case I guess only Nelson knows the PCB hole size.
That was just an example. Plenty of low quantity options here to suit a range of hole sizes :
http://au.element14.com/webapp/wcs/...dex=1&showResults=true&pf=111854786,111854787
And you can also solder to them. In any case I guess only Nelson knows the PCB hole size.
Not only Nelson, every one who bought the PCBs and have already received them.
Ok, it looks like it is the front end. I played music through it and took voltage measurements at the RCA jacks and at G-T18 on both channels I got ~100mVac at the input jacks on both channels, on the good channel G-T18 was about 400 mVac and jumping around. On the bad channel I got 0 mVac. It looks like I need to pull the JFETS. Thanks
Your DC values look good. Double check your R1 thru R4 resistor values. Can you measure the AC value at the gates of the input jfets, to make sure signal is getting to Q1 and Q2.
I tried to measure with calipers, approximately .064 inch.
Thank you very much Wdecho! Very much appreciated That would imply maybe 1.6mm.
Thank you very much Wdecho! Very much appreciated That would imply maybe 1.6mm.
I strongly suggest soldering though. If you need to remove later snip the wires a few inches from the board and solder wires back together instead of at the board. Nothing beats a good solder joint.
Bridging
I'm making 2 "stereo" amps and I intend to bridge each one to effectively make
2 mono amplifiers. I'm currently putting together a Digikey order for all the parts I don't have (mainly for the PS boards) but I'm just wondering whether bridging will necessitate any component changes / additions, or is it, as I believe, just a question of wiring the input and output for bridged operation?
I'm making 2 "stereo" amps and I intend to bridge each one to effectively make
2 mono amplifiers. I'm currently putting together a Digikey order for all the parts I don't have (mainly for the PS boards) but I'm just wondering whether bridging will necessitate any component changes / additions, or is it, as I believe, just a question of wiring the input and output for bridged operation?
I'm using 8*33000uF in my amp's PSU. I like big caps and cannot lie...
The only real potential drawback I can think of is higher inrush current. Some people argue that higher PSU capacitance involves sharper current draw peaks when the caps recharge. The sharp peaks have more higher frequency content (think FFT) than for example a wider peak that you'd get with lower capacitance. The higher frequency content may get passed on by the following regulator. Apparently the effect is measurable in some applications. I wouldn't lose sleep over it in the present application. Another potential drawback is that bigger caps can - given the chance - result in bigger explosions.
The only real potential drawback I can think of is higher inrush current. Some people argue that higher PSU capacitance involves sharper current draw peaks when the caps recharge. The sharp peaks have more higher frequency content (think FFT) than for example a wider peak that you'd get with lower capacitance. The higher frequency content may get passed on by the following regulator. Apparently the effect is measurable in some applications. I wouldn't lose sleep over it in the present application. Another potential drawback is that bigger caps can - given the chance - result in bigger explosions.
yes, i addressed the same intention in the main thread ( http://www.diyaudio.com/forums/pass-labs/276711-sony-vfet-amplifier-part-2-a-263.html#post4974961 ) and nelson replied: http://www.diyaudio.com/forums/pass-labs/276711-sony-vfet-amplifier-part-2-a-269.html#post4981159 .
i have not tried it yet, but looking forward for your feedback
i have not tried it yet, but looking forward for your feedback
It was done successfully in the conversion of F5 into F5X, there is a nice thread to read.
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thanks for the hint, i will check that.
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