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  1. Rleo6965

    555 Timer & 4017 LED Circuit

    DC supply NE555 and cmos ic 4017 , AND gate ic must be same to avoid interface signal threshold problem.
  2. Rleo6965

    555 Timer & 4017 LED Circuit

    I'm not good interpreting datasheet. Are you sure that 4017BD output pin can directly drive LED to lit? What the part number of your and gate? It seems its output capable of driving LED to lit. Maybe if you increase VCC supply into 12V will help to lit your LED and remove the current limit...
  3. Rleo6965

    Is this a diode?

    It's more accurate if you lift the diode from pcb before doing the diode test. Reading of 0.7V in 1 direction and OL in another direction means diode was ok.. Reading of 0v means shorted diode.:)
  4. Rleo6965

    soundfly sd transmitter (which wire goes where?)

    The small pcb looks like the car plug cigarette adaptor. Just wondering that how come there were big diodes for those small loose wires. I think those wire was for the supply of sd transmitter. Much better if you can locate the broken portion of wire on solder of pcb and post bigger picture on...
  5. Rleo6965

    Glow Baton Repair

    Possible a loose connection or cold solder on pcb trace. Use multimeter to test continuity of traces and switch contact. Can you post the other side of board and showing the push button switch pcb trace.
  6. Rleo6965

    TO-220 heat sink electrical isolation

    Check the collector and emitter for short using multimeter to confirm.
  7. Rleo6965

    computer/amp interface

    The reason for the distortion was because of 60hz in ac line ground connection. If you can find wireless or bluetooth audio interface between pc and amplifier it will eliminate the distortion.
  8. Rleo6965

    Bar graph driver, 5-15V

    You will have problem if psu dc output was +5V. You will notice that LM3914 +V minimum voltage was +6.8V. You need another +DC supply for LM3914 +V.
  9. Rleo6965

    Is Triac reliable as replacement for Relay for 220V multiteapped Transformer?

    Thanks Harald. I'm not really a graduated electronic engineer. But I've have long years in analog and digital electronics and already have experienced with Triac SCR and Diac. But never designed circuit using these components. That's why I asked this questions. Just another question. Mostly...
  10. Rleo6965

    Is Triac reliable as replacement for Relay for 220V multiteapped Transformer?

    20 years ago I've successfully designed and built a 5 relay Automatic Voltage Regulator for household use appliances and computers. But I did not market it because relay switching was noisy and annoying. Now I want to replace 5 Relays into Triac for faster and noiseless voltage selection or...
  11. Rleo6965

    computer not booting

    Removed cable for hardisk, cd and video card if any. Install 1 ram only. This is to test if 1 of the 3 ram have defect. Be sure that you connect speaker connector. Turn on power and there should a number beeping code long and short sound. If it does anything try othe RAM 1 by 1. Also observed...
  12. Rleo6965

    computer not booting

    Jumpers should not be touch if its only RAM problem. Only the jumper to clear cmos or set to default setting of cmos. Check keyboard LED if it blinks upon power on. If it does not blink.. You have dead motherboard.
  13. Rleo6965

    Confused about the AM26LS32ACN

    Just connect pin4 to 5V and pin12 to gnd (0V). That's it.
  14. Rleo6965

    Confused about the AM26LS32ACN

    Differential comparator have 2 inputs. 1 for non-inverting signal and another 1 inverting signal. This 2 input accept combination of high input around 3V and Low input signal and in combination will be equal to 6V. This combination opposing signal will result high output of comparator and...
  15. Rleo6965

    Confused about the AM26LS32ACN

    Pin 4 must connected to +5V to avoid intermittent problem. Unless you need to disable and enable AM26LS32 and use pin 4. The reason that AM26LS32 have 2 control pin (4 and 12 ) so that you can use any available control signal from your circuit to enable/ disable it. If you have active high...
  16. Rleo6965

    How to wire a relay TX2-L2-3V

    First time to know about this kind of relay. It seems relay coil have polarity for a certain function.
  17. Rleo6965

    Confused about the AM26LS32ACN

    Pin 4 was an active HIGH ( 5V) enable signal and pin 12 was an active LOW ( 0V ). So, if your not controlling this 2 input signal and you want the AM26LS32 always enabled. Just connect pin4 to 5V and pin12 to gnd (0V). Output voltage of AM26LS32 was almost same voltage of its supply voltage. So...
  18. Rleo6965

    Need Help soldering

    PCB traces on picture no.2 were covered by the connector and can't see traces under it. But if pcb traces 1,2,3 and 4 were connected together and also same with pin 9,10,11 and 12. Then it should work.
  19. Rleo6965

    Need Help soldering

    You mean pcb etch connector pin1 and pin12 will not be soldered. Are you sure your circuit does not need these signals on pin1? There's a trace connection on pin1. Your circuit board will not work if there's a signal that part of the circuit on pin1.
  20. Rleo6965

    How to test a mosfet?

    Here's another testing of mosfet out of the circuit using digital multimeter. I just figure it out by myself. Hope it will help you. 1. Set Digital Tester to Ohm or Resistance Test. 2. Place Black probe to Source pin and Red probe to Drain. You may use alligator clip if you want. An infinite or...
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