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Old 13th March 2012, 06:18 AM   #511
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yes, the led blinks 5 times.
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Old 13th March 2012, 12:20 PM   #512
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hi apex sir,
pls can u share this class h pcb layout. top and bottom in pdf..
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Old 16th March 2012, 12:24 PM   #513
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This circuit suply 12V DC Fan activated by signal present on amp out, very simple without NTC on heatsink.
hi apex sir,
any substitute for bd902, hard to find in shops.
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Old 16th March 2012, 10:27 PM   #514
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Originally Posted by nazirdigi View Post
hi apex sir,
any substitute for bd902, hard to find in shops.
Any PNP TO220 darlington can be use instead BD902
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Old 17th March 2012, 08:27 AM   #515
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apex sir,
i found some substitutes for bd902, is this all compatible?
bd241c ,bdw94c , tip127 , tip107 ,tip137 . tip42c.?
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Old 17th March 2012, 09:11 AM   #516
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BD241 and TIP42C are not darlingtons even BD241 is NPN so they are not suitable but bdw94c , tip127 , tip107 ,tip137 seems to be OK for substitution.

Regards!
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Old 17th March 2012, 09:19 AM   #517
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thanks astankov for the reply.
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Old 17th March 2012, 09:44 AM   #518
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Quote:
Originally Posted by nazirdigi View Post
hi apex sir,
pls can u share this class h pcb layout. top and bottom in pdf..
This class H can't work with 5 pairs of outputs, but is ok for single pair like in H200 (post #88)
DC Servo MOSFET Amplifier
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Old 20th March 2012, 04:40 AM   #519
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hi apex sir ,
i made the fan control ,
1- is this work with amp input?, not the output,any suggestion to work with input signal,
2- the fan is not working with maximum speed, i provide ac 12v, i checked fan output, it is showing 8vdc, any suggestions.

thank u.
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Old 20th March 2012, 08:19 AM   #520
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Quote:
Originally Posted by nazirdigi View Post
hi apex sir ,
i made the fan control ,
1- is this work with amp input?, not the output,any suggestion to work with input signal,
2- the fan is not working with maximum speed, i provide ac 12v, i checked fan output, it is showing 8vdc, any suggestions.

thank u.
Fan control can't work with amp input, use unregulated 15-18vdc for suply.
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