I would definitely run both audio ground and chassis ground through the interconnect. There should only be one connection (with thermistor + bridge or whatever) for the whole conglomeration, not one in each box.
If you run separate +/- rails for each channel through the interconnect, then I'd also run separate audio grounds for each channel through it. Then your audio-ground-to-chassis-ground connection would need to be in the PS box.
If you run single +/- rails to the amp, and then have local smoothing caps for each channel, then I think I'd be inclined to make the audio-ground-to-chassis-ground connection in the amp box.
If your interconnect cable is shielded, the shield can (and probably should?) be used for chassis ground.
Cheers,
Jeff.
If you run separate +/- rails for each channel through the interconnect, then I'd also run separate audio grounds for each channel through it. Then your audio-ground-to-chassis-ground connection would need to be in the PS box.
If you run single +/- rails to the amp, and then have local smoothing caps for each channel, then I think I'd be inclined to make the audio-ground-to-chassis-ground connection in the amp box.
If your interconnect cable is shielded, the shield can (and probably should?) be used for chassis ground.
Cheers,
Jeff.
thanks Jeff & Marra,
so it's either coming down to four poles (+ g -)+PE
or going up to seven poles 2(+ g -)+PE.
clear advice I can work with!
speakon seems better than my amphenol favourite.
yours
A.
so it's either coming down to four poles (+ g -)+PE
or going up to seven poles 2(+ g -)+PE.
clear advice I can work with!
speakon seems better than my amphenol favourite.
yours
A.
Has anyone attempted a higher rail volts M2?
Approx +/- 32ish MAX volts if un-cascode-d?
Works fine, you just need to regulate the input Jfets down to +/- 20V or less
and allow for the increased dissipation in the output stage.
Won't they work up to +-30V ish if one chooses lower idss ones? You mentioned one could go with higher rail in the f5 turbo article.
If you can assume that the input will be low voltage all the time, which is
not a good assumption. The Jfets we deal with are rated 25 to 30V -
tossing a 5 volt peak into a fet running a 30V rail and you have 35V.
Most of the time you would expect survival....
not a good assumption. The Jfets we deal with are rated 25 to 30V -
tossing a 5 volt peak into a fet running a 30V rail and you have 35V.
Most of the time you would expect survival....
Since we really need not that much swing out of the Jfets, I'm thinking Mr. Pass' suggestion of regulation might give us the advantage of reduced noise/ripple as an added benefit.
A BJT, zener, and a few resistors could be simple enuff, no real need to go crazy. (?)
Now we have doubled the parts count of the amp!
A BJT, zener, and a few resistors could be simple enuff, no real need to go crazy. (?)
Now we have doubled the parts count of the amp!
Last edited:
What do I have to do to reduce the wattage of the M2 down to about 10-15 watts.Would it be lower power supply voltage and what other component values would have to be changed.Want to use it as a midrange up amp and reduced heat output would be a benefit.
to keep capacitance irregularities at bay , no lower than 15V rails
just increase source resistors to decrease Iq
nothing else needs to be changed
just increase source resistors to decrease Iq
nothing else needs to be changed
Thanks for quick reply ZM. I am a newbie so if I used say 18v what size resistors would you suggest and what Iq would I be looking for.
anyway , to cut long story short - double value of source resistors , that will halve both Iq and dissipation , and you'll pretty much stay in A class envelope up to 15W/8R
Cheers altogether,
a few months ago I was listening to the audio chain of a friend of mine who owns an original F5. He was complaining he would like to add some new flavour to his chain after owning this amp for some really long time now. Thus we looked at several options on what to buy, not upgrading, but flavour switching... sadly he had some really rough time recently.
This lead me to the point where I want to make him some joy in this ugly times and was thinking of making some M2 Boards to swap out in his current F5 amplifier, as this is just a matter of a few minutes (without adjusting the amp of course). I asked him for his F5 amp (saying I would like to test something in my audio chain) to get the physical size of the F5 boards as good as possible
This is my first time drawing an amp board in Eagle so if anybody could have a look at the schematics and make suggestions for board layout would be really helpful. I have drawn one channel...
Thanks and cheers,
Fabian
a few months ago I was listening to the audio chain of a friend of mine who owns an original F5. He was complaining he would like to add some new flavour to his chain after owning this amp for some really long time now. Thus we looked at several options on what to buy, not upgrading, but flavour switching... sadly he had some really rough time recently.
This lead me to the point where I want to make him some joy in this ugly times and was thinking of making some M2 Boards to swap out in his current F5 amplifier, as this is just a matter of a few minutes (without adjusting the amp of course). I asked him for his F5 amp (saying I would like to test something in my audio chain) to get the physical size of the F5 boards as good as possible
This is my first time drawing an amp board in Eagle so if anybody could have a look at the schematics and make suggestions for board layout would be really helpful. I have drawn one channel...
Thanks and cheers,
Fabian