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Search: Posts Made By: Tube_Dude
Forum: Troubleshooting Audio Equipment 11-18-2016, 10:22 AM
Replies: 30
Views: 4,793
Posted By Tube_Dude
Re: Aiwa MX-Z3300M receiver repair, no display, capacitors in series

Me too! Can't see any good reason for the extra expenditure...!
Forum: Troubleshooting Audio Equipment 11-17-2016, 09:24 PM
Replies: 30
Views: 4,793
Posted By Tube_Dude
Re: Aiwa MX-Z3300M receiver repair, no display, capacitors in series

Hi, Budm

Quite the opposite. These capacitors are part of a voltage doubler circuit working together with D15, D16 and C17. They turn the input 30 Volts AC in 70 Volts DC at the input of the...
Forum: Troubleshooting Audio Equipment 03-24-2014, 04:56 PM
Replies: 9
Views: 2,587
Posted By Tube_Dude
Re: Sony TA-FB920R no left channel

So the SONY is already running? ;)
Forum: Troubleshooting Audio Equipment 03-23-2014, 01:10 AM
Replies: 9
Views: 2,587
Posted By Tube_Dude
Re: Sony TA-FB920R no left channel

Use any 100 Ohm 5% 1/4 W fuse resistor... It's there only to avoid parasitic oscillation of the output Mosfets.
Forum: Troubleshooting Power Supplies and Power Supply Design 12-30-2012, 06:57 AM
Replies: 42
Views: 6,227
Posted By Tube_Dude
Re: Replacing 4 diodes with a bridge

You can buy it directly from PEAK, like I have done. They ship very fast.

And yes, I love my ESR 60 analyser...

http://www.peakelec.co.uk/acatalog/jz_esr60.html
Forum: General Electronics Technical Discussion 12-12-2012, 12:21 PM
Replies: 5
Views: 2,814
Posted By Tube_Dude
Re: testing capacitor with multimeter

980uF in a 1000 uF capacitor is 2% of tolerance! :o:

Usually electrolytic capacitors manufactures gave 10% or even more rated tolerance...
Forum: General Electronics Technical Discussion 12-06-2012, 11:35 AM
Replies: 14
Views: 2,030
Posted By Tube_Dude
Re: Quad Op Amp Diagnosis

A good way is to put one multimeter probe at pin 11 (ground), and just move the other along all the IC pinout.
Forum: General Electronics Technical Discussion 12-06-2012, 11:27 AM
Replies: 14
Views: 2,030
Posted By Tube_Dude
Re: Quad Op Amp Diagnosis

Something must be wrong, or you had made a mistake in your measures.

Seeing the schematic.

Pin 4 must have 12 Volts from the power supply. (you measured 4,55)

Pin 11 must have 0 Volts...
Forum: Troubleshooting Audio Equipment 11-20-2012, 11:34 AM
Replies: 11
Views: 5,701
Posted By Tube_Dude
Re: Pioneer VSX-521, doesnt power up

Maybe the VBE transistor, used to stabilize the quiescent current of the output stage (Bias) in all temperatures of operation...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-28-2012, 10:16 AM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

The word "intrinsic" say it all. It's just not possible to build a Mosfet without the intrinsic parasitic Drain Source Diode.

See some references:
...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-26-2012, 02:39 PM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-26-2012, 02:34 PM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

Yes I know it! Sometimes is used a faster diode and with lower voltage drop, in parallel with intrinsic diode of the Mosfet NP structure, to speed up things in certain circuits. But in any case, all...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-26-2012, 12:56 PM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

This is not a built-in protection diode between D and S, but a "parasitic" diode inherent to the structure and present in all Mosfets.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-25-2012, 10:55 AM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

Yes! Maybe the best solution. :wink:
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-25-2012, 09:52 AM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

Another LED in parallel and in opposite direction will do the trick... One for P other for N.
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-25-2012, 09:03 AM
Replies: 23
Views: 4,855
Posted By Tube_Dude
Re: Mosfet Tester - Good Design?

Invert the battery polarity, and bingo. Now you have a P-Channel MOSFET Tester.

The best is to use a switch for battery polarity inversion, and you have a both channels Mosfet Tester... :wink:
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-07-2012, 03:56 PM
Replies: 27
Views: 4,070
Posted By Tube_Dude
Re: Got myself another scope.

As the lights are driven by a CCS, you can add a suitable resistor for the suited voltage drop, with 80mA current, and use any available lamp voltage... ;)
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-07-2012, 03:17 PM
Replies: 27
Views: 4,070
Posted By Tube_Dude
Re: Got myself another scope.

As I suspect the vast majority of electronic components are "in the house" PHILIPS components. Transistors, resistors, electrolytics, plastic (MKT) caps (the ones with color code bars). Only in the...
Forum: Equipment Usage, Soldering, Techniques, and Reviews 10-06-2012, 09:28 AM
Replies: 27
Views: 4,070
Posted By Tube_Dude
Re: Got myself another scope.

Hi

No, this Philips scopes are really made by Philips, even you can check it if the OP put some inside pics. I bet the great majority of caps will be the good old blue Philips axial, together with...
Forum: General Electronics Technical Discussion 09-29-2012, 09:01 AM
Replies: 13
Views: 1,407
Posted By Tube_Dude
Re: Help with school problem

Absolutely! :nod:
Forum: General Electronics Technical Discussion 05-26-2012, 01:12 PM
Replies: 3
Views: 1,371
Posted By Tube_Dude
Re: capacitor balance charging???

The resulting capacity of the 3 capacitors will be 333mF or 333.333,33 uF... :wink:
Forum: General Electronics Technical Discussion 03-17-2012, 05:14 AM
Replies: 5
Views: 1,234
Posted By Tube_Dude
Re: How do i use the Capacitance on this meter

You need to introduce the capacitor pins in the two rectangular sockets, just above the 20 Amp yellow round socket and , of course, put the scale switch in F ( Farad ) ... ;)
Forum: Troubleshooting Audio Equipment 03-10-2012, 06:54 AM
Replies: 17
Views: 5,127
Posted By Tube_Dude
Re: Tevion AVR-2006 Home Theater Receiver

Hi

Maybe the PCB your amp use is shared with a more powerful model, so the +/- 55 Volts mark.

+/- 45 Volts is normal for amps around the 100 W. Don't believe your mains transformer have...
Forum: General Electronics Technical Discussion 02-27-2012, 04:27 PM
Replies: 6
Views: 4,163
Posted By Tube_Dude
Re: Dirt cheap radio hacking!

Hi, Th3_uN1Qu3

I really appreciate your creativity. Keep up the good work!

Cheers.
Forum: General Electronics Technical Discussion 02-26-2012, 06:24 AM
Replies: 8
Views: 34,995
Posted By Tube_Dude
Re: How do I test integrated circuits with a multimeter?

With a multimeter, you can't do a really serious test about the IC, but if you have a good new IC, the same type of the suspect one, you can compare readings and maybe you can spot any significant...
Showing results 1 to 25 of 51

 
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