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A full wave bridge rectifier with a 120V rms sinusoidal input has a load resistor of 1kohm. (1) If silicon diodes are employed what is the dc voltage available at the load

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Posted on Jan 02, 2017

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SOURCE: Power problems

check all the electronic components in the main board,then replace the fault one by checking wit the help of multimeter

Posted on Oct 29, 2008

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SOURCE: Problem in fixing tv primary supply circuit.

Hi! can you provide a schematic diagram?

Posted on Aug 27, 2009

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Posted on Nov 01, 2009

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SOURCE: power supply no go. Has DCfrom bridge.

There shoud be a big elcetrolytic cap connecto the bridge rectifier output, ti should have about 150~160 vdc on that cap, if you do not have the dc on the secondary side, ti may be because it sees short circuits (you will hear fainted ticking sound), the power supply should have 5v and 12v at all time. Try heating up the primary circuits with hair dryer to see if will kick on. Post some picture will help, see example here:

Posted on Jan 17, 2010

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SOURCE: Soundcraft GIGRAC 600 pre-amp power

The resistor is acting as a fuse and will continue to blow until you fix the REAL problem. LIKELY the filter capacitor(s) beyond the bridge rectifier are failing. One needs to use test equipment to measure the current through the resistor and see if it is reasonable. The capacitors can heal briefly and then start to short. One should also check the rectifier in operation with an oscilloscope as one diode could intermittently short.

Posted on May 04, 2011

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1 Answer

No ohms on 179 fluke meter

check input protection (thermistor (black components - first in line at Voltage terminals should be around 1kOhm, next is 2W resistor = 1kOhm and then 3 varistors (blue) open or very high ohms).

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1 Answer

Fluke 179 multimeter showing wrong reading in AC, DC voltage, rest every thing working ok

input protection circuit is blown , see if you can find fusible resistor and check for open circuit (should be 1kOhm) - big resistor on the right straight from the Volts input

Mar 15, 2013 | Fluke Networks Fluke 179 Electricians...

1 Answer

Wavy horizontal lines across the screen

It sounds that the main power supply section to your TV has the fault. The horizontal thik lines that appears crawling down across the screen should be of video 'HUM'. Have you replaced the main filter capacitor at the power supply section? If not, replace it along with the main rectifier. The AC power is rectifed by a bridge and applied ot this main filter capcitor. It will have a capacitance value between 120 to 350MFD 450VDC. Check this section. Measure the rectifed DC voltage acorss this main filter capacitor. It should be around 350VDC, if your home power supply line is 220VAC. If it is 110AC, this DC voltage will be around 165VDC; and it should be. If rectified DC voltage found lower than the input AC voltage, replace the rectifier bridge. In some sets, this bridge section have four diodes. Some other circuits, a bridge rectifier stalk may be used.

May 20, 2012 | JVC AV-27050 TV

1 Answer

No phantom voltage on XR1600F. Any suggestions?

Potentially. Capacitors are what prevent the DC component from flowing through the amplifier where you want only AC, so it is pretty brutish and easy to find.

It likely is a failed zener diode, or a failed bridge rectifier, or single rectifier depending how they chose to do it. Since it is isolated to the inputs, that is where it will attach. Either to pin 2 or 3 on the XLR. It will be isoalted from the preamp by a capacitor on the order of 0.1 microfarad to 0.01 microfarad. It might be higher, but not likely.

If replacing a Zener, match for voltage, but go to a higher current type. If replacing a 1 amp bridge rectifier, go with a 3 amp if there is room. If replacing an 1N4001/1S4001 go to a 1N5403 or higher voltage rating even.

Feb 12, 2012 | Peavey Music

1 Answer

Voltage shows 80 on 110v and 155 on 240v

if you take the end of the generator off you will see a rectifier or four diodes with a varister or a full wave brige rectifier, sounds like you have a bad diode, or a shorted exite winding to the rotor, the exite winding is a small turn winding feeds the rectifier board that ac signal is converted to dc to feed the rotor ,the rotor produces a magnetic field which rotates inside the stator windings , the magnetic lines of flux from this field cut through thre stator winding inducing a voltage in the stator coils. hope this helps

May 27, 2011 | Dewalt DG6000 Heavy Duty 6000 Watt Gas...

1 Answer

Amp has power but tubes wont light up

Fuse F203 fuses the power to the tube heaters... however if the pilot light is on that fuse is OK.

A diode full-wave-bridge consisting of D206, D207, D208, and D209 rectify the power for the tube heaters. A failure of one or more of these would cause the problem.

C210, C211, C212, and C213 (1000 mfd/35 volts each) are suspect and R213 (1 ohm 5 watts) series resistor.

ALSO look for circuit board cracks through the traces and BAD solder, especially on the resistor as they sometimes get hot and solder degrades.

I have schematic if you need it... email me.

Feb 06, 2011 | Peavey ValveKing 100w All Tube Head Guitar...

1 Answer

The unit input voltage is 110 volt and was plugged into 220v outlet. . the input winding is now busted. . i was hoping to know the secondary voltage of the transformer. . i was planning to replace the...

The winding is center tapped. It generates +/-24.5 volts DC. Based on it being a capacitor input filter, we need a peak voltage about 1 volt higher to account for the droop of the capacitor and the .7 volt drop of one silicon diode...

Since we need 25.5 volts peak then we need that divided by 1.414 RMS out of ONE side of the center=tapped secondary... So our secondary voltage is 18 volts either side of center.

You will need a 36 volt center-tapped secondary. Here is one that would work:

This has two 18 volt windings that you would connect in series and a dual primary you can set for either 120 or 240 input. About $19 US.

Dec 29, 2010 | Roland Cube-20x (20w 8" Modeling Guitar...

2 Answers

I am facing a problem with my SMPS. When I press the power button, the LED, SMPS fan and processor fan turns on for a moment then goes OFF. I looked at SMPS PCB and found tht big capacitors had a chemical...

YES !!! As they have leaked their dielectric chemicals and are faulty. Replace them..And Replace both caps if a half wave rectifier bridge is what you have...And all 4 if you have a full wave rectifier bridge. ( 2 power diodes is a half wave Rect. and 4 pwr diodes is a full wave bridge. And 1 capacitor is used for each power diode... As a rule, locate the leaker and replace it AND the 1 that is closest to it that is EXACYLY the same as it is...Mfd rating, shape and size will be the exact same... Either 2 or 4 will be present...Depending on the 1/2 or full wave bridge...

Nov 04, 2010 | Computers & Internet

1 Answer

Alternator is pushing 20 volts

1981 used selenium rectifiers which were fairly low amperage. Not likely that overvoltage is the problem, but rather a failed rectifier and not changing to DC voltage (half wave). Get a 50-amp silicon rectifier from Radio Shack and replace it. Better yet, if you now have a headlight law in your state, change to a 50-amp bridge rectifier and gain more charging from the same alternator... be sure to get some help with the conversion from simple rectifier in-line to the battery and a bridge rectifier connecting both battery terminals to both alternator and ground.

Oct 07, 2009 | 1981 Suzuki Gs 550 L

1 Answer

Power cord

The power cord is
Input: 120V, 60 Hz.
Output: 9V AC, 400 mA.

So , there is no need to worry about Polarity here. Just make sure , the output voltage is around 9V. DC input is ok. since there is bridge rectifier inside.

Aug 17, 2008 | AT&T 1717 Digital Answering Machine

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