Very Nice
Toecutter
The boards from post #146 look really nice.
Whenever you start production I'm in for 4. I'll go balanced 😉
Toecutter
The boards from post #146 look really nice.
Whenever you start production I'm in for 4. I'll go balanced 😉
I'll take 4 too.
One last request: Can the power/feedback resistor locations have a second option for TO-220 Caddock-style resistors? Just extend the track inward and provide a second mounting point.
Found a nice supplier for Caddocks for all the values @$2 each.
One last request: Can the power/feedback resistor locations have a second option for TO-220 Caddock-style resistors? Just extend the track inward and provide a second mounting point.
Found a nice supplier for Caddocks for all the values @$2 each.
Do you have a part number?
I'd like to get the datasheet to check lead diameter and spacings.
Sangram, I think I found the datasheet.
What were you planing with regards to heatsinking them?
What were you planing with regards to heatsinking them?
Parallel JFET job input : check
4 Pair MOSFET output : check
Stinkin TO-247 diodes : check
Luvely !
Me take 4 boards.
(Eer, what's with the PS boards ?)
4 Pair MOSFET output : check
Stinkin TO-247 diodes : check
Luvely !
Me take 4 boards.
(Eer, what's with the PS boards ?)
Jacco,
PSU board below.
PSU board below.
An externally hosted image should be here but it was not working when we last tested it.
Hi,
I was thinking of individual sinks, TO-220 style. Fastening to board would not be necessary, I'll cut the sinks down to size and stick them on with thermal tape. The resistors dissipated about 2W each in the original F5 with 24V rails, IINM.
Those were 50 ohm, with 24V rails.
Methinks that with 220 ohms and 35V rails would result in even less dissipation so not sure heatsinks are needed. The resistors are rated to 2.25W in free air last I remember.
I was thinking of individual sinks, TO-220 style. Fastening to board would not be necessary, I'll cut the sinks down to size and stick them on with thermal tape. The resistors dissipated about 2W each in the original F5 with 24V rails, IINM.
Those were 50 ohm, with 24V rails.
Methinks that with 220 ohms and 35V rails would result in even less dissipation so not sure heatsinks are needed. The resistors are rated to 2.25W in free air last I remember.
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There's something wrong with my numbers, so it's safe to assume sinks are required for those resistors.
Assuming about 5W dissipation and a 10C/W sink we're looking at surface temperatures of about 90C. Toasty, but usable.
Assuming about 5W dissipation and a 10C/W sink we're looking at surface temperatures of about 90C. Toasty, but usable.
Power Supply Boards
Andy,
What is the diameter of the caps? What cap have you designed for?
I will take 2 power supply boards, also.
Rush
Andy,
What is the diameter of the caps? What cap have you designed for?
I will take 2 power supply boards, also.
Rush
UKToecutter said:
My guess would be enough for at least 200 amplifiers. Let's face it, there hasn't been a high-power PapaDIY amp in quite some time, this design will probably interest new people to the church of DIY Pass amps purely because of the power.
And don't forget the choir as well, we will all want one. 😀 😀 😀
Anyway, put me down for a stereo pair of amp boards and a PSU board.
I'm concerened about the size of the PSU board.
It measures 250mm x 80mm.
What cases are you guys considering?
I can move them a fraction closer together but I'm concerned about manufacturing tolerences. It would be a nightmare if they didn't fit.
It measures 250mm x 80mm.
What cases are you guys considering?
I can move them a fraction closer together but I'm concerned about manufacturing tolerences. It would be a nightmare if they didn't fit.
Power Supply Boards
Could you double row each rail? Also, if you use 30mm diameter, we would have more options. Or make provision for either 25mm or 30mm where the 30mm overlapped the 25mm rings, but use less 30mm caps. Something like this:
Mouser Part #: 667-ECO-S1HP153DA
Manufacturer Part #:
ECO-S1HP153DA
Manufacturer:
Panasonic Electronic Components
Description: Aluminum Electrolytic Capacitors - Snap In 15000UF 50V ELECT TSUP
Could you double row each rail? Also, if you use 30mm diameter, we would have more options. Or make provision for either 25mm or 30mm where the 30mm overlapped the 25mm rings, but use less 30mm caps. Something like this:
Mouser Part #: 667-ECO-S1HP153DA
Manufacturer Part #:
ECO-S1HP153DA
Manufacturer:
Panasonic Electronic Components
Description: Aluminum Electrolytic Capacitors - Snap In 15000UF 50V ELECT TSUP
I noticed Phoenix connectors on both boards. While they're definitely convenient to use, will they affect the performance of the amp in any way? Or am I better off soldering the wires?
I'd try doubling up the capacitors (4 caps wide). I'm thinking it will be easier for most people to deal with a power supply board that is 6" wide than one that is 10" long. A shorter board would definitely leave more room for transformers.
I too like the suggestion of leaving space for 30mm diameter caps if possible.
OK, I'll have a go at doubling up caps and providing for 30mm option.
In the meantime, main board modified to allow for TO-220 power resistors.
In the meantime, main board modified to allow for TO-220 power resistors.
An externally hosted image should be here but it was not working when we last tested it.
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