Hi sir
Good evening i have completed h900
before 2years but now i have time to check it.i have problem my dc voltages are at without load is 66v dc and 115 v dc after load voltages becomes 37v dc and 77 v dc what the problem please solve me.thanking you.
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Finally i success in making h900 after changing 2n5401 and its 100 ohm resistance.But how can i know that my stepper is working.please help me.thanks
At ab class mode across 100ohm volts are o.25 and at mje340 collector emitter 1.6volts just half as mentioned in apex circuit.thanking you
APEX AUDIO IR2117 step with yamaha T5N driver stage
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friend I like this driver, you can upload the full pdf I would like to build it thanks
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friend I like this driver, you can upload the full pdf I would like to build it thanks
Well the voltage noise is given in some bizarre way (FLAT + JIS A) and the current noise isn't given at all in the NJM2068 datasheet. NE5532's are commonly measured around 0.0005% distortion and can hold that into a 600 ohm load. NE5532/4 current noise is very low for bipolar opamps, so its much better at higher impedances than many bipolars for noise.
And the NJM is definitely slower on paper, having half the unity bandwidth, 2/3rd the slew rate.
Do you have some real measurements to back up your assertions? To me it looks like the NJM2068 is very competent, but its not quite up to the performance of the NE5532/5534.
Anyway here's some useful measurements I found: http://www.ac-vogel.de/Download/Dow...act, no myths and THD measurement results.pdf
FINALLY it has arrived in DIYAudio.Hope more d.i.y. class td circuits will come too, even if its just an idea .....it's possible to become a working reality together.
must be at PA protect the power 18-0-18 i + 15-0-15- why ??? what current for these sources ???
hi apex,
i cannot set the bias of h700
iam attaching pics and the layout of the board. i can vary the voltage across
collector and emitter of bd140 (2n5401) from 1.23 to 1.51 volts but there is no voltage across emitter (0r33) resistors.also attaching the measurements pic.
votage used 60-0-60v dc and 15-0-15v
regards
ravs
In these days, I will build a class H amplifier based on SD-5 of Apex. I will be posting photos here or in another single thread. I wanted to ask Mile: Can I use this step driver with +/-140 +/-70V? I think of placing 16 transistors in the output stage.
