lykkedk said:
Hmmm.... strange thing's happend here...
Could it be possible, that thedrive's the F4 perfectly... But not being able to drive my LeachAmp 2x125w ???
It's just, that if i attach my Leachamp to
There is no difference, if it's with or without my inputselector attached. (I even tried to deattach my new 4deck 10k log pot, and place my old thrusted there too, with no change at all)
I am thinking of something with impedancematch between
I will, just to be 100% sure attach one of my F4 to
Jesper.
when you find what's wrong - I'm sure that will be collective
audio and safety grounds , both in
and Leach?what's with them?
besides - why you need Leach now ?
Hmmm... no need to worry, i have found the 'error' ... so to say...
Nothing wrong with --- Nothing wrong with LeachAmp... Nothing wrong with F4...
The meganoise was comming from the dual 5vdc psu's located near inputselector / signaltraces --- OR (donno yet) from the relay's on inputselector.
What tricked me before, was that i attached Leachamp, after the inputselector, but still the psu for driving relay's / toslink was on all the time.... same second i unplugged that all noise / hum whatever dissapeared.
Now i will take a break... next move is to make the psu / xformer move 1m or more away from inputselector to see, if some relay also are making some noise.
The relay's i am using are 5vdc omron g5v -2 signalrelay's... i think they are good enough through.
.... hmmhhmmmhhmmm i really learned something today ... right ZenMod !
Jesper.
Nothing wrong with
--- Nothing wrong with LeachAmp... Nothing wrong with F4... The meganoise was comming from the dual 5vdc psu's located near inputselector / signaltraces --- OR (donno yet) from the relay's on inputselector.
What tricked me before, was that i attached Leachamp, after the inputselector, but still the psu for driving relay's / toslink was on all the time.... same second i unplugged that all noise / hum whatever dissapeared.
Now i will take a break... next move is to make the psu / xformer move 1m or more away from inputselector to see, if some relay also are making some noise.
The relay's i am using are 5vdc omron g5v -2 signalrelay's... i think they are good enough through.
.... hmmhhmmmhhmmm i really learned something today ... right ZenMod !
Jesper.
lykkedk said:Hmmm... no need to worry, i have found the 'error' ... so to say...
Nothing wrong with
The meganoise was comming from the dual 5vdc psu's located near inputselector / signaltraces --- OR (donno yet) from the relay's on inputselector.
What tricked me before, was that i attached Leachamp, after the inputselector, but still the psu for driving relay's / toslink was on all the time.... same second i unplugged that all noise / hum whatever dissapeared.
Now i will take a break... next move is to make the psu / xformer move 1m or more away from inputselector to see, if some relay also are making some noise.
The relay's i am using are 5vdc omron g5v -2 signalrelay's... i think they are good enough through.
.... hmmhhmmmhhmmm i really learned something today ... right ZenMod !
Jesper.
I told ya ...........
ROTFLMAO !!!!!!!!!!!!
EDIT:
Omrons are good enough for purpose , and can't be culprit for noise
lykkedk said:I give up on, and start all over again i think... This setup i have done is giving me sooo many problem's unfortunately.
This is where i am now...
I will try to make a new inputselector, with balanced input's only. When i use unbalanced input, the -in will be shorted inside XLR ---> RCA adapter cable.
(ZenMod suggested this earlier in thread)
This time it should be perfect!
1. quistion. what about the -in connection on other side of attenuator ?
2. quistion. should i us a ''star'' ground attached in middle of chassic, where all GND wires go to...
including the 3 or 4 gnd connections from input XLR ?
including gnd from psu
including gnd from output XLR
etc.....
etc....
3. quistion. Will it be good to GND unused input connection's or should i gnd them through e.g 100K or 10K resistors, i mean... Can all sources stand up for a shorted output ? (dac / riaa / squeezebox / walkman
Jesper.
hold your horses ;
I'll draw later tonight everything for you ........ balanced input selector with omrons or takamisawas , and grounding scheme, along with grounding of unused inputs
btw - source which cannot stand up shortie is good for nutin'
OK... ZenMod ... that's really great that you are going to make such drawing's.. I really appreciate it.
I will have a look at it, and make schm. / pcb-layout at end of week then...
Please don't hurry up for my sake... I am allway's glad when somebody want's to help, as you allways do!!!
Well... I am actually finding this amousing, not that i am not a bit dissapointed, that i coulden't make my ''fancy'' inputselector behave as i would... But thing's are really clearing up in my head now... if you know what i mean. All that stuff, i allway's was wondering about how it was working, is suddently comming clear to me, while learning... That's something i can thank you for ZenMod....
But no more thinking for me today. Looking forward to see that layout you are comming up with !
Keep it up...
Godnight from Jesper
I will have a look at it, and make schm. / pcb-layout at end of week then...
Please don't hurry up for my sake... I am allway's glad when somebody want's to help, as you allways do!!!
Well... I am actually finding this amousing, not that i am not a bit dissapointed, that i coulden't make my ''fancy'' inputselector behave as i would... But thing's are really clearing up in my head now... if you know what i mean. All that stuff, i allway's was wondering about how it was working, is suddently comming clear to me, while learning... That's something i can thank you for ZenMod....
But no more thinking for me today. Looking forward to see that layout you are comming up with !
Keep it up...
Godnight from Jesper
lykkedk said:
greedy danske - he is now going to sleep
there it is
ask if you wanna ask ..........
I didn't draw 4 position switch for powering up relays...... that's even more trivial than this
also - I didn't draw attenuator .......... is that necessary ?
don't forget to place diode across each relay coil ......... appropriately oriented , off course
Attachments
carpenter said:
I think you'd kill the 'magic', but I don't know for sure.
(BTW - I'm in the same quandary as you - Mr Carpenter)
My speakers only need a few watts. I don't care how efficient they are, I still want much more power than they need. When I play real loud (often) I 'don't want no' clipping. I think I am going to use Pumpkin to a home made active low pass (bal > SE) crossover to the Krell KSA50 to woofer, and (again) pumpkin to Babaleph to passive to altec horn.
I'm thinking I like keeping the passive on the highs. On the lows - active, where it really shines. Who knows, maybe it won't work well at all
I just gotta get rid of the DCX2496 - it's I really wanted to play F4 - it just doesn't fit in there ... well maybe a bridged one for the woofs but the Krell does an incredible job there!
mpmarino said:
Well, I though that by reducing the number of fets I'd have to lower the bias, but perhaps not. I crank my ZV7-T pretty hard and its fets are still making my horns sing like angles.
It just seems wasteful to have 100 watt on tap and only use 5 or 6 at the most.
Oh, those damnable horns.......
I guess my point is:
You'd like to run a balanced amp for your horns. The problem is that the F4 is only balanced in bridged configuration - and you'd like to keep it all F4. On top of it all, you only need a few watts for your horns.
In order to have a very low power bridged F4 you'd have to run the rails drastically low. My understanding is that the outputs don't perform as well once the rails get too low, and it seems to me that in this case it would be somewhere around the point of too low - so it seems like it's not practical to do this.
So, you'd either have to:
-Bridged F4 for woofer, unbalanced F4 for high - not balanced all the way
-Bridged F4 for woof and high - is this practical??
-Bridged F4 for woof and a different balanced amp for high - gain imbalance.
-bridged F4 and go all passive -plenty of pros and cons
-ditch the F4 and use different amps entirely??
I'm trying to think this through...
Please someone correct me if I'm wrong -
edit:
You'd like to run a balanced amp for your horns. The problem is that the F4 is only balanced in bridged configuration - and you'd like to keep it all F4. On top of it all, you only need a few watts for your horns.
In order to have a very low power bridged F4 you'd have to run the rails drastically low. My understanding is that the outputs don't perform as well once the rails get too low, and it seems to me that in this case it would be somewhere around the point of too low - so it seems like it's not practical to do this.
So, you'd either have to:
-Bridged F4 for woofer, unbalanced F4 for high - not balanced all the way
-Bridged F4 for woof and high - is this practical??
-Bridged F4 for woof and a different balanced amp for high - gain imbalance.
-bridged F4 and go all passive -plenty of pros and cons
-ditch the F4 and use different amps entirely??
I'm trying to think this through...
Please someone correct me if I'm wrong -
edit:
Yes, you can tell me, what about -in connection when running unbalanced ?As i see it, you are going to short pin 1 and pin 3 on XLR input's for running unbalanced input.
But when attenuator is placed somewhere at coax (russian?) cable the -in on pcb arent shorted anymore.
The shortning will be, whatever the attenuator is set to somewhere between 0 --> 10kohm in my situation ?
I assume that this is intented to be used with 4channel attennuator, so this is relavant for me to know...
Greedy Danska say's morning
Jesper
mpmarino said:I'm trying to think this through...
Please someone correct me if I'm wrong -
edit:
How about running bridged for the midbass?
For the top-end: remove 4 of the 6 fets and adjust bias to 1 amp per device (470 mV across source resistor)--then run that combo in a bridged configuration.
John
carpenter said:
How about running bridged for the midbass?
For the top-end: remove 4 of the 6 fets and adjust bias to 1 amp per device (470 mV across source resistor)--then run that combo in a bridged configuration.
John
Yes but you'd then have a amp that would strain to run a 8r load ...No?
Correct, and this is the quandary.
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