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Recent content by eetech00

  1. E

    Add LEDs to main power line

    Hi Use an AC opto isolator. AC Input across AC line with a appropriate current limit resistor. Output is transistor with open collector. Use the collector to drive a low voltage LED indicator. eT
  2. E

    Distant Relay Module Circuit Help

    HI Just my two cents....but if your planning to use long wire runs and small gauge wire, I think you'd be better off using a higher voltage level, like 12 volts for example. It helps overcome the wire resistance, oxidation, etc. Just an FYI, most commercial wired burglar alarm systems use 12...
  3. E

    Popping sound when switching microphone with relay

    Hi If switching audio, Use a relay with make-before-break contacts Instead of the standard break-before-make contacts.
  4. E

    Model train railway project w/o pic

    Hi For what it's worth, a real crossing gate is raised by a motor and held up by the presence of supply voltage. Gravity causes it to lower. If power is lost, the gate lowers.. eT
  5. E

    Lm13700 LTSpice Sim Help

    Hi The input offset current is modeled with an F device poly which doesn't converge very well. Change the following in the subcircuit definition: IS: F1 4 3 POLY(1) V6 1E-10 5.129E-2 -1.189E4 1.123E9 Change to: *F1 4 3 POLY(1) V6 1E-10 5.129E-2 -1.189E4 1.123E9 <--comment this out...
  6. E

    Electric curtain project: single Push button design

    Ok... To design a current sensing circuit, I'll need specs for the motor being driven. Do you have a part number and/or data sheet for the motor?
  7. E

    Electric curtain project: single Push button design

    Hi I've modified the circuit to include limit switches for each limit. FWD limit switch will activate when the limit of forward travel is reached. REV limit switch activates when the limit of reverse travel has been reached. I'm also attaching two graphs along with the revised circuit. Graph A...
  8. E

    Electric curtain project: single Push button design

    Ok...here is final corrected version that includes limit switch simulation control. The simulation assumes an arbitrary value of 4 seconds for motor to compete movement from start position to end positino. The simulation shows effect of pressing the button before movement reaches end position...
  9. E

    Electric curtain project: single Push button design

    Hello Here is a version updated with the limit switch.
  10. E

    Electric curtain project: single Push button design

    oops...just posted it....
  11. E

    Electric curtain project: single Push button design

    Hi Here's a design that uses a couple of chips...a CD4017B and CD4001B.
  12. E

    Intruder Alarm Help

    Hi Also, probably will need a timer based on the requirements stated in post #9.
  13. E

    Open door buzzer circuit help

    I think this will do what you want.
  14. E

    Score Counter PCB Help

    The datasheet for GENIE C08 specifies a max supply voltage of 5.5v. 1. Change the supply voltage to 5v. 2. The CD4026 can output a max of 6.8mA. What is the P/N of the LED display?
  15. E

    Help With Basic Seven Segment Display Counter Circuit

    You are correct...disregard.
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