hi - i am about to finish my F5 build but obviously i did it first without thinking! My layout is as below. I think i am going to have two issues 1) bias - but i thought i could get away it it by biasing the amp as shown and then put it back together after. I know that you suppose to wait for 2 hours with the lid closed so this could be a problem
2) the f5 board may not have enough ventilation because it is mounted vertically near the transformer at the back. Is this going to be a problem? I don't know if it makes any difference mounting it this way
at the end of the day, if i have to redrill and tap again then i will do it. i could put the PSU in front of the transformer and use two monolithic diodes instead to save space (I have the KBPC3510). Is this ok?
I heard that it gets very hot and the JFETs will blow so i don't want this to happen.
Thank you very much for any help
Philip
2) the f5 board may not have enough ventilation because it is mounted vertically near the transformer at the back. Is this going to be a problem? I don't know if it makes any difference mounting it this way
at the end of the day, if i have to redrill and tap again then i will do it. i could put the PSU in front of the transformer and use two monolithic diodes instead to save space (I have the KBPC3510). Is this ok?
I heard that it gets very hot and the JFETs will blow so i don't want this to happen.
Thank you very much for any help
Philip
Attachments
good evening. this layout has to be changed, the transformer on the front panel, the two psu on the low panel with the soft start and the two f5 pcb on the side sinks, centered and at 1/3 of the height
if the chassis is small you can put the transformer on the outside on the front panel, just drill some holes and pass the wires
Also. That softstart is not recomended. It uses thermistors in paralell. That will result in i current hog.
Mount transformer in front on bottom. rectifiers behind the transformer ond drop the heatsinks and mount the diodes to the bottom. Softstart all the way back en the bottom and elevate the PSU PCB over the rectifiers and sofstart. Mount speaker protection on the back. and amp PCB horizontaly on the sinks with the outputs 1/3 up from the bottom.
Mount transformer in front on bottom. rectifiers behind the transformer ond drop the heatsinks and mount the diodes to the bottom. Softstart all the way back en the bottom and elevate the PSU PCB over the rectifiers and sofstart. Mount speaker protection on the back. and amp PCB horizontaly on the sinks with the outputs 1/3 up from the bottom.
hi - i bought a couple of monolithic bridge rectifiers to save space 600v, 35a. They are not expensive. can i put the PSU in front of the transformer and mount the F5 boards with the transistors in the middle horizontally? the soft start can be mounted towards the front on the side. (it just saves me redrilling this way if it is safe to do so). i can mount the speakers protection at the back plate.
You mention it's not a good soft start. i thought the soft start will be "out of the way" when the PSU is in use? thanks for your help
I would try to get all high voltage AC as far away from the amp boards as possible.
The thermistors will be bypassed after some time. So you might be okei. But that depends on the thermistors and startup current and bypass time.
The thermistors will be bypassed after some time. So you might be okei. But that depends on the thermistors and startup current and bypass time.
As stated above, ditch the soft start module and build with thermistors exactly like the build guide.
Or copy the F5T termistors.
Or copy the F5T termistors.
philiphifi, can we see a photo of your heatsinks and their dimensions?
It's not clear to me what you have and I worry about thermal dissipation.
It's not clear to me what you have and I worry about thermal dissipation.
yes of course. i bought this case
DIY Aluminium Case with Power Indicator and Heatsink 396x360x195mm - Audiophonics
i posted a reply but nothing went. Ah well. yes i bought it from here with the dimensions
DIY Aluminium Case with Power Indicator and Heatsink 396x360x195mm - Audiophonics
thank you for your help
DIY Aluminium Case with Power Indicator and Heatsink 396x360x195mm - Audiophonics
thank you for your help
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