You'll have to forgive me... I'm really not an EE. I'm a matsci who works in nanomechanics....
I'm about to put together an F5 an antek 300VA 18V toroid. The 'biggest' diodes I have is the MUR1560, 15 Amps max current. I modeled my PSU in PSUD and saw that the startup current is well below an amp. I'm seeing up to 6 amps/channel current draw (3 amps peak per device into 8 ohm speakers)
Nelson uses 35 amp parts, I see other people using the 30 amp MUR diodes. I have some heatsinks here that I could put on the diodes to keep the T down.
I'd hate to pay shipping for 4 pieces, but I'd hate to start a fire as well. Am I grossly undersizing my diodes?
I'm about to put together an F5 an antek 300VA 18V toroid. The 'biggest' diodes I have is the MUR1560, 15 Amps max current. I modeled my PSU in PSUD and saw that the startup current is well below an amp. I'm seeing up to 6 amps/channel current draw (3 amps peak per device into 8 ohm speakers)
Nelson uses 35 amp parts, I see other people using the 30 amp MUR diodes. I have some heatsinks here that I could put on the diodes to keep the T down.
I'd hate to pay shipping for 4 pieces, but I'd hate to start a fire as well. Am I grossly undersizing my diodes?
1560 diodes
The 1560's will be just fine - 15A at 600volts and a Trr of about 60nS will give you a fairly "fast" sound but still quite "smooth" - not many "nasties".
Suggest using a R-C-R-C configuration with ) 0.1R's (non wirewound, if possible) and 10,000 (ripple cap) and 22,000uF (2nd power cap) - bit different than the Duncan specs, but good results.
The 1560's will be just fine - 15A at 600volts and a Trr of about 60nS will give you a fairly "fast" sound but still quite "smooth" - not many "nasties".
Suggest using a R-C-R-C configuration with ) 0.1R's (non wirewound, if possible) and 10,000 (ripple cap) and 22,000uF (2nd power cap) - bit different than the Duncan specs, but good results.
I'm trying to use stuff I already have. I had modeled a CRC with a 12mF initial cap and then had planned on using inductive wirewounds in parallel with some of the 3W panas. Then a pair of parallel 12mF caps for 24mF of power capacitance.
I actually found a place that carries the irfp9240 locally! Then I dug through my parts and found that I have 75 ztx450 and no 550s. Hopefully the local joint has that part in stock or I'm going to have to go begging from people I know. Goes to show what I know when I thought I had everything I needed.
I actually found a place that carries the irfp9240 locally! Then I dug through my parts and found that I have 75 ztx450 and no 550s. Hopefully the local joint has that part in stock or I'm going to have to go begging from people I know. Goes to show what I know when I thought I had everything I needed.
I wouldn't get too concerned about the difference between the wirewounds and the Pana resistors - they do have an effect on the amps sound, but it can easily be later upgraded if offensive.
What amp and speakers? - they are a system, you know- room requirements (and acoustics), speakers to suit (sound, size, volume), amplifier to drive them.
What amp and speakers? - they are a system, you know- room requirements (and acoustics), speakers to suit (sound, size, volume), amplifier to drive them.
well, the F5 obviously. powering a pair of diy proac 2.5 clones. i do most of my listening nearfield in a smallish room so I'm not too worried about having only 25 watts.
Not sure if jackinj is still supplying kits for this, but he has matched IRFPs and other things - well worth the money.
The proac clones, eh? perhaps you got some really good crossover componenets, yes? and good wire, maybe silver?
The proac clones, eh? perhaps you got some really good crossover componenets, yes? and good wire, maybe silver?
goertz foil inductors and music caps. for wire i'm using 12 Ga oxygen free copper. i've matched my own transistors though.
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