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Offline mazari
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« Reply #740 on: July 05, 2017, 03:58:11 pm »
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hi for all.my dp didn't work i think the problem comes from the ne556 when i mesure the output at pin 9 (Supposed to be 9 volts)but i found 1.5volt i changed it with a new one but still the same voltage.please  did  anyone have an idea about what would be he problem?thank you in advance

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« Reply #741 on: July 05, 2017, 06:11:50 pm »
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All I can think of is check the -E and +E  .  Are they correct?   

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« Reply #742 on: July 06, 2017, 03:30:37 am »
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thank you.yes they are correct.but i can change frequency at pin 9 does it work?

Posted on: July 06, 2017, 02:01:07 am
the irf840 will get very hot when i connect the coil

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« Reply #743 on: July 06, 2017, 06:57:11 am »
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  Check all components I indicated within the circle.

Your voltage drop on Pin 9 could be bad component, Partial Short , even a component  set with wrong orientation (FET, Diodes, C-32). 

Solder Bridges?,

C-32 Partial Short ? Orientation ?

Contamination on PCB.  Flux ?

Check all your associated Voltages to GND.

+E
-E
-12

HF

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D- Delta XR71 Latest schematic TroubleShoot.jpg

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« Reply #744 on: July 06, 2017, 07:32:16 am »
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thank you for your help.I'll check in circle you selected and tell you the results

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« Reply #745 on: July 06, 2017, 08:08:55 am »
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rev 3.1 schematic. last.

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« Reply #746 on: July 06, 2017, 08:46:08 am »
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thank you for the schematic.

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« Reply #747 on: July 06, 2017, 09:33:04 am »
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  Thank You.  I bet I have like seven versions of these things.   Angry

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« Reply #748 on: July 06, 2017, 12:11:15 pm »
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Quote:Posted by homefire
  Thank You.  I bet I have like seven versions of these things.   Angry


i had ordered a batch of the boards... Cheesy i did choice black color for silk  Great

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« Reply #749 on: July 06, 2017, 12:20:14 pm »
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 my dp emit  continuous sound  i have changed  two diodes in parallel with irf840 .now i have to adjust it .many thanks for your help

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