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Treasure Hunting & Metal Detecting Forum Message Boards - Detector Hunter Whites Minelab Tesoro XP > Tech Talk > Metal Detectors > PI Designs & Deepseekers (Moderators: Eugene52, Cornelius) >

Why IRF740 is hot (delta pulse)

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apocalypto Topic starter

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	Why IRF740 is hot (delta pulse) « on: January 14, 2010, 07:20:25 am »

Hy everyone
I whould like to know why IRF740 is hot when i turn on Delta pulse?

thank you.

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Tuxnor

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	Re: Why IRF740 is hot (delta pulse) « Reply #1 on: January 14, 2010, 07:45:52 am »

hey http://thunting.com/smf/pi_designs_deepseekers/unified_delta_pulse_sniffer_xr71_schematic-t9706.0.html

kontroll 680ohm resistor and diode below irf740,and what battery are you using?,and what coil
to litle resistanse in coil will probely heat your irf740
i saw som sugestion about change 680 . i have not solderd it in is place jet..
other detector is pulse pi gary chemeletic nr2

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apocalypto Topic starter

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	Re: Why IRF740 is hot (delta pulse) « Reply #2 on: January 14, 2010, 08:09:25 am »

Hi TUXNOR

- Continued sound (~15s) repeated each 30 seconds

- Battery : 12V 2.3 AH

- Serach coil : ?25 cm, 30 turns of 0.5 enemable CU

- IRF 740 Heat in 5 min working.

- Very Low noise from Coil search

- NO light from VD16 (Labeled Charge) Please help me

-I measured the voltage +E and -E between 1 and 8, 1 and 4 of D6A (+5.04 and-5.04 volts)

Look at to see the picture of my delta pulse

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Please help me

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	Re: Why IRF740 is hot (delta pulse) « Reply #3 on: January 14, 2010, 08:41:03 am »

hello

i am looking in to it now--i can also see on pictures that you use ceramic cap instead of mf polyester caps only 15pf and 47 pf in ceramic
but mesure all zener diodes around irf740 and your 9.1v diode ..all components around lm556
tryed change lm556 ?it is in controll of charging led also..
mesure bc557 transistor close to 9.1 v diode.
was your irf740 new or used when you mounted it ?
and the 2.2k resistor by the irf 740 shall be 1w
do you have a better overlay picture of your deltapulse?

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	Re: Why IRF740 is hot (delta pulse) « Reply #4 on: April 16, 2011, 12:10:51 pm »

if all is ok you can replace the irf740 with irf 840.its the same and not that sensitive like 740.

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	Re: Why IRF740 is hot (delta pulse) « Reply #5 on: April 17, 2011, 09:51:45 am »

irf 740 will get hot, if transmitter is not working check the transmitter if output is oscillating in squarewave 100-400hz, check the coil resistance, to low coil resistance lower than 1.5 ohm will cause irf740 to get hot. or the cable going to coil partially shorted.

ram,

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	Re: Why IRF740 is hot (delta pulse) « Reply #6 on: April 29, 2011, 06:38:40 pm »

The same problem was me instead of bc 557 bc 546 feet wore a mistake but I worked hard on the last day you want to check with a reverse connected diode input voltages abstraction burned now look there if you want to change the shape ?şeniyorum easy to come alone, I say ...

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	Re: Why IRF740 is hot (delta pulse) « Reply #7 on: January 09, 2017, 07:53:12 am »

can anyone pls help me?
my delta pulse/xr-71 is not working with any coil anymore. it all started when i accidentaly plug in a different search coil bcoz of hurrying. my best coil set up was about a diameter of a basketball,it was 4 meters cat6 utp cable and it can detect a 5 peso coin at 13inches air and ground test. i accidentaly plug in a coil about/maybe 2 ohms resistance. does that means my irf740 need to be replaced?

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	Re: Why IRF740 is hot (delta pulse) « Reply #8 on: January 09, 2017, 08:18:53 am »

Need to see if your IRF740 and it's driver are still alive. Check the output to coil with a Multi meter in AC WITHOUT COIL CONNECTED to see if it's firing.

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	Re: Why IRF740 is hot (delta pulse) « Reply #9 on: January 09, 2017, 08:26:10 am »

if its still firing, what value should i get in my multimeter? and if its not firing what would be the diagnosis? thanks for answering.

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