Search results

Search Forums New Posts
  1. Tha fios agaibh

    Help, Thermal Switch for Shower Exhaust Fan?

    You need a rib relay (relay in a box)
  2. Tha fios agaibh

    Designing a Time Delayed Relay

    Perhaps just modify this to 220v? http://www.rockler.com/i-socket-110m-tool-and-vacuum-switch
  3. Tha fios agaibh

    555 monostable help

    It's the same as pushing the button in the car. I don't have a print but should be easy to find a point to tie into to get 12v eg accessory power. The relay contacts will push the button for me.
  4. Tha fios agaibh

    555 monostable help

    Exactly, I want to use it in my car so when i remote start it it will start my heated seats. So about 13volt supply. the on delay time is not critical say 5 or ten seconds and then need the relay contacts to switch for just under a second to simulate pushing a button.
  5. Tha fios agaibh

    555 monostable help

    Hope i can get some direction designing a timer circuit. What i want is a 5 second "on delay" on power up that would drive a monostable timer which would give a "one shot" of about 1/2 second to fire a small relay. I have seen many examples using a push button or neg trigger but only one timer...
  6. Tha fios agaibh

    Garage Door controller reverse function

    If you have the spare parts this is doable, but if you plan on buying everything it will cost nearly twice as much as buying a new opener for $150 If your willing to ignore the reversing function (unsafe) it can be done with 4 relays for under $50
  7. Tha fios agaibh

    Garage Door controller reverse function

    Aside from photoeyes types, there is also edge sensor (weatherstrip at bottom of door with pressure switch in it) and older style doors use a limit switch that is on the track. When excess force is applied from downward force it makes the track bar move back and trip the limit switch.
  8. Tha fios agaibh

    scr driver circuit for battery charger

    Something like the IRU3055 might work (3 phase pwm). but without a schematic to work from I'm lost.
  9. Tha fios agaibh

    scr driver circuit for battery charger

    The combination of 3ph transformer and scr's (thyristors) are what generates the aprox 40vdc power (160amps) for charging battery. The control board was what generated pwm signals to the scr gates. There are single DC to PWM circuits available that would work, but I need to synchronize the...
  10. Tha fios agaibh

    scr driver circuit for battery charger

    I have several 3phase 36volt battery chargers (fork lift battery) with bad control boards. Replacement of these obsolete boards are hard to find and near the cost of replacing the entire charger. I was wondering if it's feasible to design a simple circuit that could drive the 3 internal scrs...
  11. Tha fios agaibh

    Repairing dim display on car stereo

    You can test them like a regular diode using you dvm, or could rig up a few batteries and probe say 3v leads across each led (observing polarity). As far as finding replacement leds, try digikey or similar online electronics site.
  12. Tha fios agaibh

    What voltage should I measure??

    Yes, put your meter away. Its a bad Ballast Remove the can from the ground (there should be enough slack in the wiring) The ballast will be in the jbox above the can. Replace it being sure to observe wire colors.
  13. Tha fios agaibh

    Alternative uses for GFCI receptacles

    How about using the relay in the homes junction box,instead of using the GFCI outlet for other than its UL listing . Not a good idea to intentionally divert household current to ground regardless of the curent. Better to use low a switching circuit like a switching transistor to fire the relay...
  14. Tha fios agaibh

    What voltage should I measure??

    Steve is right.You are messing with high voltages that your meter cant handle. Some light fixture have igniters that can fry your standard meter in an instant. If your up to the task, turn off the breaker to the lights and replace the ballast inside the can. Most of these types of ballasts...
View older results
Top