Hi Everyone, This is not related to audio but i would be great full if someone could help. I have a Petsafe RF-1010 that got hit by lightning. I’ve got the psu (18v dc) that came with it also not working although on the schematic it states using a 12vAC psu 800mA
My Dc power supply showed a short straight away with increased power consumption. I detected shorts on various transistors. I replaced these. Now the unit is working at a lower voltage of 12vdc but when increased to 18vdc or powered by the AC PSU of 13vAC it is causing one transistor Q2 2N5401 to heat up real bad and the circuit is not operating correctly. Please see attached schematic.
I checked voltages and they are correct at points mentioned on the schematic 16.6vdc with 13vAc tx as power source. ( I don’t have an exact 12vAC transformer psu so nearest I can get is a 13vAC)
I replaced U4 lm741 with another similar opamp IC still no difference. I’ve checked all other components resistors caps and the zenor diodes D3 and D4 IN4148 are good.
Any ideas on where I go from here would be great. It’s strange that the circuit behaves perfectly when powered by 12vdc lab psu. But when voltage is increased to 18vdc it shuts down power supply showing a short. I have changed this particular transistor to another one of same but no change. I take the transistor out and test it on peak tester it’s perfect. So something is not a happy camper and I can’t find it when operating st suggested voltage.
Hope someone can help
paul
My Dc power supply showed a short straight away with increased power consumption. I detected shorts on various transistors. I replaced these. Now the unit is working at a lower voltage of 12vdc but when increased to 18vdc or powered by the AC PSU of 13vAC it is causing one transistor Q2 2N5401 to heat up real bad and the circuit is not operating correctly. Please see attached schematic.
I checked voltages and they are correct at points mentioned on the schematic 16.6vdc with 13vAc tx as power source. ( I don’t have an exact 12vAC transformer psu so nearest I can get is a 13vAC)
I replaced U4 lm741 with another similar opamp IC still no difference. I’ve checked all other components resistors caps and the zenor diodes D3 and D4 IN4148 are good.
Any ideas on where I go from here would be great. It’s strange that the circuit behaves perfectly when powered by 12vdc lab psu. But when voltage is increased to 18vdc it shuts down power supply showing a short. I have changed this particular transistor to another one of same but no change. I take the transistor out and test it on peak tester it’s perfect. So something is not a happy camper and I can’t find it when operating st suggested voltage.
Hope someone can help
paul
Attachments
You trying to repair one of these Pet torture devices?
Straight from PETA:
https://www.peta.org/blog/shocking-truth-invisible-fences/
Straight from PETA:
https://www.peta.org/blog/shocking-truth-invisible-fences/
Ok fair enough. I won’t fix it then. l am interested in the electronics in it though.
I will advise the customer on your links
thanks
The dog learns not to cross the boundary, and won’t receive a shock anymore. Usually. My wife had a beagle that learned how to wear one of these things down, then escape. The shock device also sends a warning tone as the dog gets close, then an actual shock if it ignores the warning. Suzy beagle would walk along the boundary and let it “tone” until the battery died. The tone generator eats power. No more tone, and she was up the road.
The fact she tried it over again tells me the shock wasn't powerful enough... 😀 It should be a completely traumatic experience to discourage further encounters LOL
She would stop short of the shock - but knew the piezo speaker would run the battery down eventually. Damn persistent.
Suzy was over a decade ago. None of the others ever had that kind of problem solving capability. The dog run here is 100% fenced and a lot smaller now - so no more invisible fence.
As far as the original circuit is concerned, don’t forget to check resistors in a failed power section. They may look fine. Ie., make sure R21 isn’t open. That would cause excessive continuous current in Q2.
As far as the original circuit is concerned, don’t forget to check resistors in a failed power section. They may look fine. Ie., make sure R21 isn’t open. That would cause excessive continuous current in Q2.