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Search: Posts Made By: barry wilkins
Forum: Troubleshooting TVs and Video Sources Today, 05:09 AM
Replies: 9
Views: 153
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

Hi yes cleaned up the mess.
Perhaps when the board was made they did not have the proper surface mounted capacitors.
Attached some more pictures .
Got the 12 volts and 5 volts working .
Just need...
Forum: Equipment Usage, Soldering, Techniques, and Reviews Yesterday, 02:56 PM
Replies: 68
Views: 49,913
Posted By barry wilkins
Re: Any experiences with this ESR meter circuit?

I made one some years ago,the only problem was a bit of drift .
I fitted a small bulb in the oscillator ,that cirtainly made a big difference.
Pinched the idea from HP

Barry Wilkins
Forum: General Electronics Technical Discussion Yesterday, 02:52 PM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

Thinking about it I decided to use two transistors in a darlington configuration .seems to work OK .
Next step is to try it out.
Forum: Troubleshooting TVs and Video Sources Yesterday, 02:49 PM
Replies: 9
Views: 153
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

I dont know i,t is right bodge took a lot of getting off.
I spoke to the owner and she said it had never been repaired before ?
As I said before the caps are far too large ,jammed in and glued down...
Forum: Troubleshooting TVs and Video Sources Yesterday, 10:37 AM
Replies: 9
Views: 153
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

Photos 227657

227658
Forum: Troubleshooting TVs and Video Sources Yesterday, 10:29 AM
Replies: 9
Views: 153
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

OK thanks for that
Just run the TV up today after sorting out a few thing its working .
Ordered some much smaller capicitors for the power supply which should finish the repair.
Still cannot...
Forum: General Electronics Technical Discussion Yesterday, 10:22 AM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

Hi think you are right about the transistor ,just knocked up a circuit to try ,a capacitor about 10 uF and a IRFBC30 mosfet (got lts of these) .
The output from the counter is now AC coupled so if...
Forum: Troubleshooting TVs and Video Sources 01-13-2021, 01:36 PM
Replies: 9
Views: 153
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

Hi where is the go advanced ?
Forum: General Electronics Technical Discussion 01-13-2021, 01:29 PM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

wont work the switch is binary ,the lamps are controlled by the ecu
Forum: Troubleshooting TVs and Video Sources 01-13-2021, 11:33 AM
Replies: 9
Views: 153
Posted By barry wilkins
SOVOS Flip down TV SVKTV156A

I tried to attach a picture of power supply ,but it will not upload.
I removed a capacitor off a simlar circuit ,it measured 10uF which suprised me .
Pin 2 of the IC seemed to be the supply voltage...
Forum: General Electronics Technical Discussion 01-13-2021, 11:13 AM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

Here is a picture of my first design227560
Forum: General Electronics Technical Discussion 01-13-2021, 04:17 AM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

No the alarm is not can bus ,but I expect the hazard lamps are ,as the lights seem to be controlled by an ECU.
What I did think ,if I changed the output to AC coupled it would not matter if the...
Forum: General Electronics Technical Discussion 01-13-2021, 04:11 AM
Replies: 8
Views: 193
Posted By barry wilkins
Re: Load Testing Audio PA Amplifiers

When I was an engineer we had 1000W RF generators ,these actually American radio transmitters.
We had oil filled dummy loads for testing ,but they were 50 ohms.
You can get devices which are...
Forum: Troubleshooting TVs and Video Sources 01-11-2021, 10:46 AM
Replies: 6
Views: 156
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

I tried another 12 supply it still shut down.
I think this has been repaired before, the capacitors on the board are normal type and have been glued down .they are far too big ! .
Looked like a...
Forum: General Electronics Technical Discussion 01-11-2021, 04:54 AM
Replies: 11
Views: 431
Posted By barry wilkins
Re: 4017 counter reset problem

Hi not able to get multisim to work at the moment .
Soon as the weather improves I will first check the pusles that come out of the alarm with one of my scopes, sure that it was 5 pulses certainley...
Forum: Troubleshooting TVs and Video Sources 01-11-2021, 04:41 AM
Replies: 6
Views: 156
Posted By barry wilkins
Re: SOVOS Flip down TV SVKTV156A

Hi it is not mains driven ,it has a 12volt power supply , as I am not much up on LCD tvs ,beginning to think it could be the back light.
So I will take a look at that.

Barry
Forum: General Electronics Technical Discussion 01-10-2021, 07:05 AM
Replies: 11
Views: 431
Posted By barry wilkins
4017 counter reset problem

I have been trying to make a counter for my vehicle alarm .I need to reduce the pulses that operate the hazard warning lights.
Because of the ECU you cannot connect directly to the lamps ,so I...
Forum: Troubleshooting TVs and Video Sources 01-10-2021, 06:38 AM
Replies: 6
Views: 156
Posted By barry wilkins
SOVOS Flip down TV SVKTV156A

Hi has any body got any info on this LCD TV?
Something is dragging down the 12V power supply ,looks like a severe overload

thanks

Barry Wilkins
Forum: Equipment Usage, Soldering, Techniques, and Reviews 09-27-2020, 03:17 PM
Replies: 1
Views: 558
Posted By barry wilkins
Faulty DVM

One of my DVMs has gone faulty .
I know why this has happened I was repairing some SMPUs ,they do have some high voltages on the 130volts and 425 volts .It has a range of 1000 volts this is why I...
Forum: General Electronics Technical Discussion 03-03-2020, 10:29 AM
Replies: 2
Views: 672
Posted By barry wilkins
Car Ammeter

After a number of expreiments I gave up the torroid idea.
Could not over come the zero problems ,it has to be the B/H curve the flux in the ferrite does not return to the same point ,so after the...
Forum: General Electronics Technical Discussion 03-03-2020, 10:12 AM
Replies: 4
Views: 592
Posted By barry wilkins
MC34063 Buck Boost

Hi I have trying to make a power supply to give me outputs
Say +10 volts & -10volts from 12 volts.
I have some MC34063 ICs so am using them ,but the circuits do not work ?
Even the one on the...
Forum: General Electronics Technical Discussion 01-11-2020, 10:42 AM
Replies: 27
Views: 1,412
Posted By barry wilkins
Re: Need a circuit that switches ON when a 5 volt source drops to 4 volts or less

A LM311 with a resistor circuit will make a level sensor like a sync seperator .
Used one in my diode radiation detector I made last year.
Barry Wilkins
Forum: Troubleshooting Game Consoles & Other Weird Devices 01-11-2020, 10:39 AM
Replies: 1
Views: 449
Posted By barry wilkins
Ultrasonic Bath

Circuit for an Ultrawave bath ,the recovery diiode was short circuit.
Barry Wilkins
Forum: Troubleshooting Audio Equipment 01-06-2020, 09:59 AM
Replies: 3
Views: 475
Posted By barry wilkins
Re: Citreon C3 car radio poor reception

Managed to get the aerial off the car .
There is an amplifier in the base of it ,and its wet .
So I will dry it out and try it.
Barry
Forum: Troubleshooting Audio Equipment 01-05-2020, 01:31 PM
Replies: 3
Views: 475
Posted By barry wilkins
Citreon C3 car radio poor reception

I have a problem with the radio in my car ,its been going on for some time now.
Just poor radio reception,it has got a small aerial at the back of the car .
I can see a nut head holding the aerial...
Showing results 1 to 25 of 149

 
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