thanks Still,but that is not my-hands work but by another man that does it with laminator(device for laminating visit-cards). i also attent to buy one,i am looking for it at e-bay but it must have springs so it could receive 2mm of pcb through it.
that device is just great for toner transfer!
that device is just great for toner transfer!
Questions for APEX A33
Hello, mr. Mile. I have a few questions about the APEX A33 amplifier (2 pairs of output transistors).
The maximum supply voltage is? (V)
Nominal supply voltage -? (V)
Power per load 8 Ω -? (W)
Power per load 4 Ω -? (W)
BIAS output stage -? (MA)
THD -? (%)
Thank you!
Hello, mr. Mile. I have a few questions about the APEX A33 amplifier (2 pairs of output transistors).
The maximum supply voltage is? (V)
Nominal supply voltage -? (V)
Power per load 8 Ω -? (W)
Power per load 4 Ω -? (W)
BIAS output stage -? (MA)
THD -? (%)
Thank you!
The maximum supply voltage +/-65V
Nominal supply voltage +/-55V
Power per load 8 Ω 120W
Power per load 4 Ω 200W
BIAS output stage 60mA
THD 0,002%
Hi sir Mile, you can help me about f100 psu ? I have a trafo with 2x48 AC and i want to modifi the psu for this trafo. What change need to make? Thank you very much!
An externally hosted image should be here but it was not working when we last tested it.
a dual 48Vac transformer is likley to give you ~+-70Vdc on your amplifier supply pins.
It will be higher when your mains supply voltage goes higher than the transformer rated primary voltage.
For a nominal +-55Vdc you should be using a dual 40Vac transformer, or a little bit lower (38, or 39Vac).
On my 240Vac mains I get ~ +-58.5Vdc from a 230:40Vac 4% regulation transformer.
Last edited:
Whit this trafo conected to f100 PSU AND 10.000UF JVC super audio capacitor 71v i got +- 65 VDC without f100 amp conected on the psu. At +-65v F100 amp give me 390w on 4R and 190w an 8R
that is really good. Sorry for my english. ALL THE BEST!
F100 AMP and PSU with luxman preamp and tone corection. Very good sound but some problem with the F100 psu is going to protect when the volume of my preamplifier is 50% percent. Preamplifier have output 1V .
An externally hosted image should be here but it was not working when we last tested it.
You make a mistake!
The voltage after recovery is calculated with the formula "U rectified = Alternative : 0,707" so 48 : 0.707 = 67.8V . With circuit losses we got 65V
you have not measured correctly.
Try measuring the transformer when it is delivering it's rated power into the rated resistive load.
eg.
If you have a dual 48Vac 500VA transformer, then the rated current is 4.208Aac
The rated load will be 48Vac/5.208Aac = 9.216ohms
You need two power resistors rated for well in excess of 250W each with a value of 9r216, then you can measured the rated voltage when you input a mains voltage equal to the rated primary voltage.
Did you do any of that?
Try measuring the transformer when it is delivering it's rated power into the rated resistive load.
eg.
If you have a dual 48Vac 500VA transformer, then the rated current is 4.208Aac
The rated load will be 48Vac/5.208Aac = 9.216ohms
You need two power resistors rated for well in excess of 250W each with a value of 9r216, then you can measured the rated voltage when you input a mains voltage equal to the rated primary voltage.
Did you do any of that?
Last edited:
Hi
Thank you, that is great but I would love to get the black one what I can iron transfer to the PC board.
Last edited:
This thread has been - and still is - quite derailing. Perhaps someone may want to clean it up, just keeping the postings that relate to the topics?
Thank you!
Best regards!
Thank you!
Best regards!
The GND beside the bridge rectifier is actually the transformer Centre Tap connection.
It would be less confusing to label it CT.
