My F4
Just finished over the weekend. Back to enjoying the music...
(Copy of post in the F4 thread: hope that's not breaking the rules...)
Just finished over the weekend. Back to enjoying the music...
(Copy of post in the F4 thread: hope that's not breaking the rules...)
Not as cool as I'd like: with about 205mV across the .47 ohm resistors, the heatsink is getting pretty hot: I have to be a bit determined to keep my fingers on for 5 seconds
. I will do another round of adjustments now everything is wired up and I may take the bias down a fraction.I used all the heatsink I had...
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Tim, also keep a close eye on those in-rush limiters (thermistors). Depending on your amps operating condition, they can run very hot--and it looks as though you have them mounted on/near wood.....
Unless you're into the aromatherapy of burnt pine, this might be a problem....
Ken
Unless you're into the aromatherapy of burnt pine, this might be a problem....
Ken
Thanks: there's no sign of heat on the top: I didn't want to put my finger on them seeing as they are part of the power supply...😱
Now that I look at it, those sinks don't seem connected to ground.... BAD mmmmkay, all exposed conductive surfaces should be grounded.
Thanks for your concern. Actually I have run a grounding wire down through the bottom of the case and out to all the metalwork. Ohmmeter says it's all grounded.
Tim
BigE
shure you can.
Simple transistor/relay timer.
once power up capacitor charges and trip a transistor which operate a relay that by pass the NTC
One day I will get it tidy and then post SCH for all.
Same pictures and more on my My F5 tread.
PIC Just a teaser in the corner the Aux suply and controll circuit.
In the back ground the 12mU caps for DC filter
shure you can.
Simple transistor/relay timer.
once power up capacitor charges and trip a transistor which operate a relay that by pass the NTC
One day I will get it tidy and then post SCH for all.
Same pictures and more on my My F5 tread.
PIC Just a teaser in the corner the Aux suply and controll circuit.
In the back ground the 12mU caps for DC filter
Attachments
Actualy found drawing of surmentioned circuit
http://www.diyaudio.com/forums/attachments/pass-labs/224321d1306339526-my-f5-new-controll-sch.doc
http://www.diyaudio.com/forums/attachments/pass-labs/224321d1306339526-my-f5-new-controll-sch.doc
Pass Aleph P1.7 Preamp
Hi all
I would like to share my latest creation, My just completed Pass Aleph P1.7
I was completed this afternoon, and has been running all day with background music
The matching Pass X-Ono, was completed some time ago. (see Post 262 and 263) of this thread.
Now to finish off my 1.2 power amplifiers. Quite a bit of work still required.
Thanks
George
Hi all
I would like to share my latest creation, My just completed Pass Aleph P1.7
I was completed this afternoon, and has been running all day with background music
The matching Pass X-Ono, was completed some time ago. (see Post 262 and 263) of this thread.
Now to finish off my 1.2 power amplifiers. Quite a bit of work still required.
Thanks
George
Attachments
@GeeVee,
congratulations on this excellent piece of work. This looks really professional. Wish I had so much craftsmanship.
congratulations on this excellent piece of work. This looks really professional. Wish I had so much craftsmanship.
Pass Aleph P1.7 Preamp
Hi Blistard and Jacco
Thanks for your kind words. You are correct in the Spectral look. That was exactly what I was trying to achieve.
The only thing remaining is to change the knobs on the x-ono, as shown in post 262 and 263 to match.
I would like to share how I made the front panell.
The case is an off the shelf unit from the VT4C shop in Hong Kong.
The front is a 2 part affair, with a removable sub panell.
I drew up the front lettering in AutoCad (could use any other package for that matter), and printed them on overhead transperency film.
I then got 2mm thick clear acrylic cut to size for me, and then sandwiched the lot together. There are fastening screws from the rear.
It gives the front a really nice depth
Regards
George.
Hi Blistard and Jacco
Thanks for your kind words. You are correct in the Spectral look. That was exactly what I was trying to achieve.
The only thing remaining is to change the knobs on the x-ono, as shown in post 262 and 263 to match.
I would like to share how I made the front panell.
The case is an off the shelf unit from the VT4C shop in Hong Kong.
The front is a 2 part affair, with a removable sub panell.
I drew up the front lettering in AutoCad (could use any other package for that matter), and printed them on overhead transperency film.
I then got 2mm thick clear acrylic cut to size for me, and then sandwiched the lot together. There are fastening screws from the rear.
It gives the front a really nice depth
Regards
George.
