F5 power amplifier

[Zen Mod]

Betcha it happens!!!😎

better hurry , before Papa brings new toy ...........

 

[Nelson Pass]

Yes. The B1 is scheduled beginning of July.

😎

 

[tms0425]

Yes. The B1 is scheduled beginning of July.

😎

Darn, I better hurry up and get that F5 done. I just barely made it on the F4 when the F5 dropped.

 

[jackinnj]

Yes. The B1 is scheduled beginning of July.

😎

I think that it was Eaton's AIL Division which did the avionics for that particular model (yeah, I know that for a fact.)

 

[jackinnj]

Here's the compensated version with the potential for putting trimming resistors on the various source resistors, 150 puffs on the inputs:

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

 

[tms0425]

Jack - So maybe put an extra wide pad set on R12-13 for those of us that have axial instead of to220 resistors? Or even doubles for using the 100r 3w.

 

[jackinnj]

Yes, I can put an extra bit of trace and a pad for the axial resistors -- if you can give me the width of the leads and I will dimension the drill-hole appropriately.

I am not going to do a GB, but I will post the gerbers and a 100% PDF so folks can burn their own boards.

 

[tms0425]

The Mills 5w is 0.17" dia x 0.562" body, 0.032" lead dia.
Mills 5w from PartsConnexion

I didn't compute it but assume a single 5w 100r would be enough(?)

 

[fredlock]

Jack,

Is that the final version of your tweak on F5? I'm sure you got it working to your expectation that's why you already posted the circuit diagram. I'm curios how it sound and would like to try it before the B1 is introduce by NP. 😀 😀

 

[chinsettawong]

Fredlock:

F5 sounds wonderful. It is an interesting design with no capacitor in the circuit.
In Thailand, we are arranging a group buy. For about one week, there is already a big number of people signed up. Please note that most of these guys are mostly devoted to vacuum tube amps. The post is at http://www.htg2.net/index.php?topic=31809.0

If you think you like to try, please do. I highly recommend it.

Wachara C.

 

[jacco vermeulen]

Cool, there's a DIY-Girl F5 builder on the Thai list.

(makes me wonder if there's an ex-Threshold JP lady soldering on the kitchen effort when the Master is having one of his Cali Cabernet hangovers again)

 

[jackinnj]

Here's a modification -- I put in 2 vias on each resistor lead -- 75 mil diameter, 39 mil drill, spaced 600 mils.

An externally hosted image should be here but it was not working when we last tested it.

 

[tms0425]

Thanks Jack!

 

[neutrino_th]

Hi

"Yes. The B1 is scheduled beginning of July."

Anybody can tell me more about this new project? I'm impatient...

 

[danny_66]

http://www.firstwatt.com/watts_new.htm

 

[Zen Mod]

Hi

"Yes. The B1 is scheduled beginning of July."

Anybody can tell me more about this new project? I'm impatient...

naah .......

just a fancy hair - dryer ..............

just go and buy cheap chinese one ......... it's cheaper and hotter ......

 

[stefanobilliani]

http://www.firstwatt.com/watts_new.htm

WOW 🙂

 

[Tea-Bag]

The Mills 5w is 0.17" dia x 0.562" body, 0.032" lead dia.
Mills 5w from PartsConnexion

I didn't compute it but assume a single 5w 100r would be enough(?)

Parallel 100ohms = one 50 ohms. Buy a mills 50ohms. (actually four for two channels)

 

[neutrino_th]

Thanks danny_66.

"The B4 Crossover / Equalizer has been designed around the needs of full range speakers (Lowther, Fostex, and all the newer entries). It has circuitry for equalizing to the needs of full range drivers and for adding a woofer."
perfect for my Fe206.

 

[tms0425]

Parallel 100ohms = one 50 ohms. Buy a mills 50ohms. (actually four for two channels)

Of course, but I just wanted to make sure you don't need that much dissapation for some reason not obvious to my tiny brain. Since it is just feedback I doubt it. Likely the 100r 3w are just what Nelson had a lot of so there are two ;-)