hi apex sir,
these days i am buissy,
now i am free to work with amp.
supply dcv 95v,
dc offsett 20mv,
today i checked with 10 ohm 10 watt resistor instead fuse and i measured the dc volt for bias, it showing 0.485vdc, is it bias very low,(u mentioned 15ma per pair, so totally 1.35vdc on 10 ohm) am i correct?
output base to gnd volt showing 0.420vdc and other side 0.460vdc.
9 pair outputs and with bd681, bias resistor 8.2k.
these days i am buissy,
now i am free to work with amp.
supply dcv 95v,
dc offsett 20mv,
today i checked with 10 ohm 10 watt resistor instead fuse and i measured the dc volt for bias, it showing 0.485vdc, is it bias very low,(u mentioned 15ma per pair, so totally 1.35vdc on 10 ohm) am i correct?
output base to gnd volt showing 0.420vdc and other side 0.460vdc.
9 pair outputs and with bd681, bias resistor 8.2k.
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hi apex sir,
today i give 50vdc with 8 pair outputs,
it clips at 30vdc,
dc50v sag to 46v,
load 4 ohm,
100hz sinewave feed input.
outputs are 45degree celcious,
basevolt is 220mv.
today i give 50vdc with 8 pair outputs,
it clips at 30vdc,
dc50v sag to 46v,
load 4 ohm,
100hz sinewave feed input.
outputs are 45degree celcious,
basevolt is 220mv.
and another testing with 70vdc,
8 output pair
base volt is 120mv,
clips at 40v, 70v sag 57vdc
outputs 70ddegree, at clips.
sound is clear .
100hz sinewave, and music tested
8 output pair
base volt is 120mv,
clips at 40v, 70v sag 57vdc
outputs 70ddegree, at clips.
sound is clear .
100hz sinewave, and music tested
Seems pretty normal to get 200 watt clip at 70v, although looks like your power supply is merely adequate. You might need something larger to get more power... Sagging a bit too much, but still depending on the size of your trafo (350-450va?) it looks normal.
C5200/A1943 can take 95v rails, but you will need bazillions of them, since their SOAR is limited. You are better off with MJ21193/94 or MJL43281 types
this does not make sense.
Supply is +-50Vdc
Supply sags to +-46Vdc when full power is delivered into 4r0 test load.
So far, am I interpreting your data correctly?
What is this?
Do you mean an output voltage?
Do you mean 30Vpk?
Dop you mean 30Vac?
What does this mean?
Is this a temperature?
Measured where?
On the device plastic case?
On the device backplate that you can't access?
On the heatsink very near the device?
On the heatsink 10mm away from the device?
What does this mean?
Have you looked at the datasheet?
What is the maximum (25°C) current the device can pass for one shot 100ms? or continuously?
I'll tell you:
~0.45A @ 95Vce for Tj=150°C, continuous.
~0.75A @ 95Vce for Tj=150°C, one shot 100ms.
How much capability is left for signal delivery when the device is not held at Tc=25°C?
If you want to run this thing into 4 ohms, I'd go with 20 pairs (40 devices) at 95v rails.
As Andrew says, at 150C, the C5200 is about a 40watt device. Your Output stage should be able to deliver about 1800watts (assuming a nice safety margin) this means about 40 devices or 20 pairs.
This is why no manufacturer uses these devices with high rails...
I would not go over+/-80V with simple class AB. Class G/H is more comfortable for higher voltage...
Sajti
Sajti
except in ClassG/H topologies where the transistors are switched in to deliver the peaks for VERY SHORT transients and are kept cool/cold by enormous capability heatsinking.
hi sajti,
how many pairs u recommend for 80vdc? for full volume.
with 80 vdc how many watts into 4 ohm?
what is clip level on output volt ac?
Post734
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What is this?
Where is your comment?
DON'T put your words inside the quote. It will be interpreted as editing the contents of a quote
I was binned for changing (just slightly) a quote !
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