Read posts #443, #452 and in post #405 you have some voltage test points,
Regards
Last edited:
then i cant use triacs on my amp...
Then use a relay. If the amp is sufficiently big that an ice cube won't handle the current, then get one of the big ones they use for A/C compressors. You can get those with 24VDC coils.
hi apexaudio
greetings
red wire 94 volts positive
brown wire 70 volts positive
green 0
blue wire 70 volts negative
black wire 94 volts negative
will send high resolution picture of pcb both rails supply drop to 16 volts approx
short suspected
thanking you
andrew lebon
greetings
red wire 94 volts positive
brown wire 70 volts positive
green 0
blue wire 70 volts negative
black wire 94 volts negative
will send high resolution picture of pcb both rails supply drop to 16 volts approx
short suspected
thanking you
andrew lebon
Attachments
Input GND missing! Amplifier can't work without connect input GND. I can't see wire jumper (red line on component layout) on botom side of pcb, somethimes I forget connect that wire.
Regards
Last edited:
hi apexaudio
greetings thanks for your reply connection should be made to input gnd by seperate wire to pin next to input in is that correct
1 for pcb protect circuit for heat sensor transistor can mje340 be used instead of bd241
thanking you
andrew lebon
greetings thanks for your reply connection should be made to input gnd by seperate wire to pin next to input in is that correct
1 for pcb protect circuit for heat sensor transistor can mje340 be used instead of bd241
thanking you
andrew lebon
That's correct,
TIP31 can be used instead BD241, any NPN transistor can be used as thermal diode sensor but then reff voltage on comparators must be calibrate, becouse different 'Vbe on' for different transistor.
Regards
hi eesbibol
greetings thanks for your thought first hclass trying to get used to
how it works gut feeling will be a great amplifier such a nice feeling to know
so many helpful people around makes me feel good
thanking you
andrew lebon
greetings thanks for your thought first hclass trying to get used to
how it works gut feeling will be a great amplifier such a nice feeling to know
so many helpful people around makes me feel good
thanking you
andrew lebon
Hi Apex
does your Class H Stepdriver working with +/- 70 and +/- 130 V DC ?
have SMPS from another Class H amp with this output Voltage
does your Class H Stepdriver working with +/- 70 and +/- 130 V DC ?
have SMPS from another Class H amp with this output Voltage
This is simple amplifier, and there must be simple mistake on your amp, I hope you fix it soon,
Regards
Last edited:
I don't want to diyers be afraid with "monster" amplifier useing six or seven pairs of output transistors, I use minimum on small pcb, you can add more outputs on larger pcb if you want. I see many amplifier with simple VAS simpler than my in "100w Ultimate Fidelity Amp" with seven pairs of outputs on large pcb called "monster" that's "fatamorgana" for my opinion.
Regards
Last edited:
what do you mean by fata morgana?
are you in favor or not to 7 pair output?
in this picture 2 pcb top & bottom share 1 heatsink?
Attachments
![P1010423[1].JPG](/community/data/attachments/162/162613-6c5086b8ac524e073b9ed3828e48f3c6.jpg?hash=bFCGuKxSTg)
I mean, some amplifiers just look like "monster", and for a real are very simple, and not much powerfull as they designers say.
Yes I favor to use 7 pairs, but only on B500 and H900.
Amplifier on picture use 2 pcbs on 1 heatsink with 2 fans, work on 0,+/-55VDC,+/-110VDC, 2500w transformer. Heatsink is about 3kg, and amp can work on 2R load, but this is H1200 amplifier, not H900.
Regards
does your h1200 mean 1200w per module or 600w+600w
h900 450w+450w?
this means that those who knows amp math can upgrade h900 to
h1200?
Last edited:
You can get 1200W per module with MJL outputs.
Diyers with more expirience can easy upgrade H900 with add outputs, but I think no need to get more power, you must have speakers for this power.
Regards
does that mean, adding more output trannies would increase h900's power output up to such 1200w???...🙂 🙂 🙂...