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Old 5th May 2010, 05:53 PM   #231
teslar is offline teslar  Thailand
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Currently I build H900 use +/- 80 Vdc. Not use for step drive.
Next project buil B500+TL072 Step Drive great project and wait for IR2117 have in elctronic store shop in the country.
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Old 5th May 2010, 09:04 PM   #232
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Quote:
Originally Posted by teslar View Post
Currently I build H900 use +/- 80 Vdc. Not use for step drive.
Next project buil B500+TL072 Step Drive great project and wait for IR2117 have in elctronic store shop in the country.
This is thread: MOSFET Amplifier IRFP240/IRFP9240,
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Old 5th May 2010, 09:30 PM   #233
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Originally Posted by teslar View Post
Currently I build H900 use +/- 80 Vdc. Not use for step drive.
Next project buil B500+TL072 Step Drive great project and wait for IR2117 have in elctronic store shop in the country.
The IR2117 could be used in conjunction with a fast PIC driving two IRFP240's for a simple class D amplifier.
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Old 6th May 2010, 06:51 PM   #234
Valenca is offline Valenca  Brazil
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Ok, I'm glad to hear that, what is BIAS current?
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Never measure the BIAS, can you help me?

I could not send the pictures because they are too big to attach ...
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Old 6th May 2010, 07:30 PM   #235
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Never measure the BIAS, can you help me?

I could not send the pictures because they are too big to attach ...
Send link for picture.
Use 10R resistors series in rail and set bias to get abot 2V on 10R resistor.
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Old 7th May 2010, 03:00 AM   #236
Valenca is offline Valenca  Brazil
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Originally Posted by apexaudio View Post
Send link for picture.
Use 10R resistors series in rail and set bias to get abot 2V on 10R resistor.
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Apex OK, I could send pictures of the connection setting BIAS?
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Old 7th May 2010, 08:10 AM   #237
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You can also measure DC voltage on 0,47R 5W resistor for setting BIAS, about 10mV is OK.

Last edited by apexaudio; 7th May 2010 at 08:14 AM.
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Old 10th May 2010, 08:28 AM   #238
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Sorry, I can say now is operete well !!!
What is your sound impressions compare with other amps?
Regards
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Old 10th May 2010, 11:54 AM   #239
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Default Hv350

HV350 Pcb size: 200x50mm
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Old 10th May 2010, 01:34 PM   #240
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You can also measure DC voltage on 0,47R 5W resistor for setting BIAS, about 10mV is OK.
I think 10mV is to little. About 35mV should be ok with good power supply and cooler.
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