Question about Computers & Internet

1 Answer

Ground i am using DAC0808 and LF351.I am using batteries(5,10,15) to supply reqd. voltages. where to ground -ve of batteries??? with ground pin of the DAC or else where?????

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Expert
  • 152 Answers

Ground is just a reference value.... connecting the -ve of batteries with ground pin of DAC is enough....

Posted on Feb 09, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

2 Answers

Will not start


Any lights lit on the dash , SECURITY , check engine ? Check for battery voltage at the crank relay socket , pin # 30 an pin 85 ! . pin 87 takes battery voltage from pin 30 when the relay is energized an sends it to the S terminal on the starter solenoid . Pin 86 is the control circuit from the PCM . The PCM supply's a ground to energize the relay .That depends on the if there is nothing is wrong with the anti-theft system . If you pull the relay out an look on the bottom you will see the pin numbers I mentioned .

May 07, 2015 | 2000 Oldsmobile Silhouette

2 Answers

I have a 2006 crown Vic and it's not tring to start change the alternator have a new battery


so now you have to check the starter system and wiring

you already looked over the fuses, right?

Apr 01, 2015 | 2006 Ford Crown Victoria

1 Answer

How do i turn on a compaq ps-7231 power supply?


Pin Name Color
Description 1 3.3V Orange +3.3 VDC 2 3.3V Orange +3.3 VDC 3 COM Black Ground 4 5V Red +5 VDC 5 COM Black Ground 6 5V Red +5 VDC 7 COM Black Ground 8 PWR_OK Gray Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok) 9 5VSB Purple +5 VDC Standby Voltage (max 10mA, max 2A in ATX 2.2 spec) 10 12V Yellow +12 VDC 11 12V Yellow +12 VDC 12 3.3V Orange +3.3 VDC 13 3.3V Orange +3.3 VDC. ATX V2.3 / EPS12V V2.92 both define that the PSU has to use remote sensing to compensate cable drops on the 3.3V line. Because of this there is an additional brown cable crimped together with the orange cable either to pin 13 (ATX) or pin 1 (EPS12V). 14 -12V Blue -12 VDC 15 COM Black Ground 16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF. 17 COM Black Ground 18 COM Black Ground 19 COM Black Ground 20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units) 21 +5V Red +5 VDC 22 +5V Red +5 VDC 23 +5V Red +5 VDC 24 COM Black Ground /PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.

Feb 26, 2015 | Compaq Computers & Internet

1 Answer

POLARITY


Question does not make real sense---set will use two different grounds in the power supply---some voltages are measured from earth ground (metal chassis) and some in supply from "HOT" ground.

Jun 12, 2012 | Televison & Video

2 Answers

My obd2 isn't getting power what I do?


Check Pin #16 on the Data Link Connector (DLC) for battery voltage. (See Diagram)

If there is no battery voltage present check the fuse marked "OBD II" in the engine compartment fuse block. It is a 10 Amp fuse. If the fuse is good, repair the circuit between the fuse and pin #16 at the DLC.
If battery voltage is present at Pin 16 at the DLC, check for ground at pin 4 on the DLC. If ground is not present, repair the ground circuit between the DLC and Ground G202 located at the left side of the dash.
HINT: the easiest way to check BOTH of these at the same time is to use paper clips plugged into pin #16 and Pin #4 and connect a light bulb between the two. If the light illuminates brightly, power and ground are both OK.
If no problem with power or ground is detected at the DLC, check the Owner's Manual for your code reader.

5_11_2012_10_06_19_pm.jpg

May 11, 2012 | 2000 Kia Sephia

1 Answer

I have a 95 mazda B2300 4 cyl the battery light stays on my lights are dimeer then usual i had the alternator tested they said it was good what could the prob be


The battery light will only come on if the voltage supplied to the alternator is lower than the current battery voltage. It is either the alternator or instrument panel. I've never seen an instrument panel go bad on those. Look at the alternator, I've seen one with a motor mount that went bad and the alternator was laying on the frame grounding out the alternator.

May 13, 2011 | 1995 Mazda B-Series

1 Answer

The volume is messed up. I can turn my TV up all the way and put my ear next to the speakers and barely hear a faint voice. The TV itself is fine though and its not the DvD I'm using, I've switched it a...


You will probably need instruments (voltmeter, oscilloscope) to track down this problem.

At first I was going to suggest there is a fault in the audio buffer amplifier, but the only way that would be the case is if it is the bias circuitry inside a chip shared by both the left and right sound signals, or a power supply problem. The other possibility is the voltage reference for the Digital-to-Analog Converter (DAC).

How it works: the DAC gets the digital audio information from the DVD data processor. It generates an output voltage that is a fraction of the voltage reference value. For example, suppose the voltage reference is 2.5 Volts, and the audio data for the right channel is a 1 followed by fifteen 0's (half of full scale, which is sixteen 1's). The audio DAC should produce 1.25 Volts on the right channel. The audio DAC is almost certainly a dual channel device, and uses one voltage reference for both. If the voltage reference is putting out a very low voltage because it is bad or overloaded by another part, you would get the symptom you are having.

What to look for: identify the audio buffer amplifier IC (trace the circuit back from the sound output jacks). While a DVD is playing, use an oscilloscope to compare the input waveform with the output. You will probably have to search for and download the datasheet for the amplifier IC so you can see where the left and right input waveforms go in. If they are the same amplitude, or the output is larger than the input, the amplifier is probably OK. If not, check the voltages on the other pins on the chip to make sure they are correct. In particular, look at the voltage on the pin labeled "Vcc" or "Vdd" on the datasheet. It should be the same as one of the voltages printed by the connectors coming from the power supply board (give or take several tenths of a volt). If it isn't you'll need to check the power supply voltage with an oscilloscope to see if you have a bad capacitor. It is common for the first capacitor in a power supply filter to fail while the second one is good. This can produce a low voltage output that may still look like a clean straight line on the scope. However, for an audio amplifier, the result would be a low-amplitude, distorted sound.

If all is well with the audio amp, you will have to find the audio DAC chip. Start by downloading its datasheet and identifying the voltage reference input. Measure the voltage there. If the DAC has an internal voltage reference, look for a pin that provides this voltage externally.

Cautions: the laser in the DVD player can cause permanent eye damage if it is accidentally viewed directly. If the player mechanism does not have a cover built into it, put a sheet of opaque material (e. g., cardboard) over the DVD drive while you work on it. Keep your fingers away from the power supply, especially the high voltage section where the power cord comes in (often outlined on the power circuit board with white or black dashed lines, bridged only by transformers and several small parts). Get an anti-static wristband, put it on and connect the lead to the metal case of the DVD player. This is so any static electricity you build up in your clothing won't destroy parts in the DVD player. The transistors inside the integrated circuits, especially the data processor and DAC, are very delicate, and can be ruined by a discharge too small for a human to feel as a shock.

This is probably a "hobbyist" repair job. It's my understanding that this model is worth under $35, and most professional technicians want a minimum of $50 just to look at it. If you get lucky, you may find another unit of the same model that is no longer reading discs (try your local electronics recycler). You can swap the mechanism or main board with that unit to get one working (observe anti-static precautions with both parts - the laser circuit is also vulnerable to electrostatic discharge).

Dec 05, 2010 | Philips Magnavox DVD Player MWD200F

1 Answer

I want to convert this power supply for use with a battery charger for model aircraft. I need to know the color codes for the wires and also the pinout and which wire is the power on.


Pin Name Color Description
1 3.3V Orange +3.3 VDC
2 3.3V Orange +3.3 VDC
3 COM Black Ground
4 5V Red +5 VDC
5 COM Black Ground
6 5V Red +5 VDC
7 COM Black Ground
8 PWR_OK Gray Power Ok (is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation)
9 5VSB Purple +5 VDC Standby Voltage (max 10mA)
10 12V Yellow +12 VDC
11 3.3V Orange +3.3 VDC
12 -12V Blue -12 VDC
13 COM Black Ground
14 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.
15 COM Black Ground
16 COM Black Ground
17 COM Black Ground
18 -5V White -5 VDC
19 5V Red +5 VDC
20 5V Red +5 VDC

/PSON activated by pressing and releasing the power button while the power supply is in standby mode. Activating /PSON connects the power supply's /PSON input to ground, thereby switching the power supply to full-on condition.
18 AWG is recommended for all wires except pin 11, which should be 22 AWG. For 300W configurations 16 AWG is recommended.
There are several ATX variants.
Hope this helps.
If this helps you resolve your problem, please
consider giving me a rating of 4.It will help me as well. Thank you.

Nov 26, 2010 | Compaq (243890-001) 250-Watt Power Supply

1 Answer

Pin Name Color Description


Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Apr 01, 2009 | HP Compaq dc7100 PC Desktop

1 Answer

Screen goes white


check the -ve ground voltage (we called it G1) on the card back side of CRT gun. the 1 or 2 no. pin. when u switch on it the voltage must be between 40 to 60 in negetive. if don't then follow the track and replace the controller transister. also the electolytic capacitor in that line....change the filter near EHT transformer. (that might be 10mfd/250 volts DC). used to filter that negitive supply.


if the monitor is compaq or samsung model then it is different.
for that u have to tell me then i will tell u....

Feb 08, 2008 | Gateway FPD2275W LCD Monitor

Not finding what you are looking for?
Computers & Internet Logo

Related Topics:

59 people viewed this question

Ask a Question

Usually answered in minutes!

Top Computers & Internet Experts

Brian Sullivan
Brian Sullivan

Level 3 Expert

27725 Answers

kakima

Level 3 Expert

102366 Answers

David Payne
David Payne

Level 3 Expert

14161 Answers

Are you a Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...