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  1. Rleo6965

    How to repair this

    It's been 2 months since you start post repair this cheap made in china soldering iron. Are making fun of us?
  2. Rleo6965

    basic digital troubleshooting

    When your computer hangs up. Then your solution. Power off and restart computer or press the Reset button.:D Reset button will initialize all ic to its default or correct state. Depending on the design of circuit.
  3. Rleo6965

    basic digital troubleshooting

    If you can post diagram of circuit with motor problem. We might give you idea how troubleshoot that circuit. Then later apply those technique in future repair.
  4. Rleo6965

    basic digital troubleshooting

    The secret of successful troubleshooting of analog or digital circuits was first understand all components and how this components arranged in circuit to form a functional block. Once you understand the functional block. This will help you analyse which block have failed to result certain...
  5. Rleo6965

    What can a analog volt meter do that a digital one can't?

    For NPN Set Ohmmeter to RX10. Place wire clip to Emitter and other end of the clip to ( + ) RED Probe for Japanese Analog Meters. Then place ( - ) Black probe to the collector with your hand touching or holding both the collector and Black Test Probe. A slight movement or high resistance...
  6. Rleo6965

    What can a analog volt meter do that a digital one can't?

    In analog tester I can compare transistor leak or gain and compare it to another transistor for correct replacement. Very useful with push pull transistor. Using RX10 Ohmmeter range. Very old technique. You can't do this with digital tester.
  7. Rleo6965

    Common group problem and seperate supply

    I think you have to modify your 2 relay circuit. There's a possibility that both relay will turn on and +12V and +9V will be shorted together. How about using 1 SPDT relay. Place the fan on Com terminal and +12V and +9V on NC and NO terminal. Another option. This will solve your +9V...
  8. Rleo6965

    push start button / relay diagram

    Can you post your circuit diagram for more clarification.
  9. Rleo6965

    basic digital troubleshooting

    It's still the best to understand the components and circuit first and then monitor the inputs and resulting outputs. Oscilloscope was the best equipment for me. Because you can see the waveform. ie. if digital signal does not reach the required digital threshold or output causing the digital...
  10. Rleo6965

    Auto off switch underload?

    Motor still heats up even protected by fuse or circuit breakers. Motor still be damages in the long run. Limit switch was still the best option. Most industrial design was to use limit switch.
  11. Rleo6965

    soldering small SMT resistors, capacitors and transistors, I can't get them flat

    One technique you can try was first solder small amount of lead on both pads. Then place your solder tip in such a way that both pads was touch and therefore simultaneously melt the leads on the pads. Move solder iron on side to have space for smd. Place the smd using tweezer and removed the...
  12. Rleo6965

    solenoid power boost

    Try lubricate moving part of solenoid.
  13. Rleo6965

    Capacitor Help

    I think he want to know how audio signal able pass or flow thru the capacitor which have a insulator in between the terminal of capacitor.
  14. Rleo6965

    Stop stealing things out of my truck!!!

    My neighbor place his Police Uniform inside the car near the window. Nobody dare to touch his car.
  15. Rleo6965

    Back EMF of an electric motor.

    Another positive effect of EMF. It can be used for Dynamic Beaking of DC motors. Negative. Don't hold those 2 wire terminals if somebody rotating the armature. You will be electrocuted.:D
  16. Rleo6965

    Magnifier Glasses and Lamps , I can't see or solder fine pitch from my desk why?

    If you have a good video camera w/ macro, zoom lens might be helpful. Of course you need a tripod.
  17. Rleo6965

    Triggering relay with 12v

    Small 12V relay solenoid only consumes 30ma. to activate it. This will not fry your psu. Unless you wrongly wire it. Show us your diagram. We might help.
  18. Rleo6965

    Problem with test wiring for DIY ipad dock

    You can use resistor or capacitor . But its safer for the capacitor if there is a dc component on output of the 2 device. Since we don't know exact output circuit of the 2 device. Its better on the safe side. Your 2 device might be expensive.
  19. Rleo6965

    Problem with test wiring for DIY ipad dock

    DC Coupling capacitor will isolate the 2 audio device to avoid damage or shorting it other. The capacitor also act as "ac resistor" for audio frequency. We call it impedance. . Thus audio output would not likely to overheat. Unlike your your original circuit using direct wiring that short...
  20. Rleo6965

    Problem with test wiring for DIY ipad dock

    Do you still have shorted 2 outputs of Ipad and Iphone to the 3.5mm jack. You will damaged output of 2 device. You should placed 2 pcs DC coupling capacitor in series to both output wires for left and right channel..So, you need a total of 4 capacitor for 2 device or audio sound source.
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