MOSFET Amplifier IRFP240/IRFP9240

[ravpreet420]

apex 555 protection pcb size ?

Simple Soft-start, DC, Thermal and Overload Protect with NE555. Use single 12vac for suply.

pcb size ?

 

[wattaniya]

hi ravpeet the size is,
41mm - 61mm

 

[ravpreet420]

thanx nazirdigi

 

[apexaudio]

hi apex sir,
now i put 10k ntc .
now the protect circuit is working, but when power on , the relay delay time is one second ,because the led indicator only blinking once and after relay connects the led permanently lights on, how can i increase the delay time to 3 or 5 seconds?

Replace cap 1uF with 10uF or 680k with 2,2M and delay time will increase.
Regards

 

[wattaniya]

thanks apex sir for the reply

 

[wattaniya]

Replace cap 1uF with 10uF or 680k with 2,2M and delay time will increase.
Regards

i changed the 1uf cap with 10uf , the delay time is 10seconds, and i change it to 2.2uf but delay time 2seconds, tommorow i'll buy 4.7uf and i'll check it.

 

[adeel]

apex sir,
send me psu-10 pcb pdf file
thanks

regards

 

[wattaniya]

hi apex sir,
today i change to 4.7uf cap, and its worked perfect, delay time is 5second,
thanks for the pcb.

 

[apexaudio]

hi apex sir,
today i change to 4.7uf cap, and its worked perfect, delay time is 5second,
thanks for the pcb.

Delay time is 1second per 1uF 🙂

 

[apexaudio]

...the led indicator blink 5 times (1Hz)?

 

[wattaniya]

yes, the led blinks 5 times.

 

[wattaniya]

hi apex sir,
pls can u share this class h pcb layout. top and bottom in pdf..

 

[wattaniya]

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.

 

[apexaudio]

hi apex sir,
any substitute for bd902, hard to find in shops.

Any PNP TO220 darlington can be use instead BD902

 

[wattaniya]

apex sir,
i found some substitutes for bd902, is this all compatible?
bd241c ,bdw94c , tip127 , tip107 ,tip137 . tip42c.?

 

[astankov]

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!

 

[wattaniya]

thanks astankov for the reply.

 

[apexaudio]

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)
http://www.diyaudio.com/forums/solid-state/162081-dc-servo-mosfet-amplifier-9.html

 

[wattaniya]

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.

 

[apexaudio]

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.
Regards