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  1. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Please post a link to those testers.
  2. dorke

    Newbie Potentially Fried Board

    Agree, a 40W iron is to much for those delicate SMDs. Use a 25W, preferably with heat control. Don't use pumps, they will almost surly lift up pads! For cleaning solder paste residue use an old toothbrush and clean well with rubbing-alcohol and ear-tips can help as well. Do watch that...
  3. dorke

    Cruise "on" light (GM cruise control adapted to another vehicle)

    Welcome to EP. The simplest way would be connecting a "6V LED". You can purchase one "ready made" or make your own. If you DIY, you need to know the LED nominal current and Vf(both very with type,color,size etc.) Then calculate the resistor value by R=(6-Vf)/iLED
  4. dorke

    Cheapest tool to measure Total Harmonic Distortion

    As you already know,these professional tools are very expansive. If you are not going to use them on a daily baisis I wouldn't recommend one for you.
  5. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Yes, it is the same. Remember, you have to reduce the voltage you are feeding it in order not to damage it.
  6. dorke

    Newbie Potentially Fried Board

    Welcome to EP. Yep, could be you did damage this unit. The label on it says "6VDC", yet you say you used "9V". Other than that, you should remove all those tiny solder splashes to prevent shorts. Use an old toothbrush and clean well with rubbing-alcohol . To learn how to solder properly...
  7. dorke

    Cheapest tool to measure Total Harmonic Distortion

    Is free of charge cheap enough for ya ?;) This software scope can measure THD as well. You will need to reduce the level of your signal to less than 0.7V peak to peak...by a transformer and voltage divider.
  8. dorke

    Can anyone identify this type of connector?

    If it's from a Nissan car. I would try a local Nissan service/dealer/electrician , they should have the part you need.
  9. dorke

    making diy transformer

    BAD idea,very BAD idea.:eek: If you value your own life/family/property please don't try that!!!
  10. dorke

    Device that will allow specified voltage to pass through for a specified amount of time?

    I would control a "series-pass device" with that mono-stable(HW or SW). The series-pass device will be selected according to the voltage(and drop-out allowed)/current to the device that needs to be powered . It can be a BJT,MOSFET,relay etc. more info is obviously needed.
  11. dorke

    Confusing results from voltage amplifier circuit

    IS your signal a 3.3V "digital square wave" ? You wont to shift it from 0-3.3v to 0 to 5.5v? Why are you using an audio power amp here? Obviously not the way to go...
  12. dorke

    Nodal Analysis of a Circuit

    The equation is correct. The directions of currents are chosen arbitrarily, but it must be kept consistently through all node equations. What do you mean by "V1 as the reference node"? I would choose the "ref" point to be the junction between the power supplies. This way you have 3 equations...
  13. dorke

    Removing circuit

    That is slow and cumbersome if you have to do a lot of the same. A dedicated tool can be a great help : quick, easy, safe (no glitches);)
  14. dorke

    Op Amp Circuit Noise

    So many issues with that circuit :( 1. If you will have a full swing of ±35V output from op-A and feed it(like you do) to the input of op-B with ±18V P.S rails,you will destroy op-B ! Since you will go above it's absolute max input voltage rating. 2.The use of high value resistors (M-ohms)...
  15. dorke

    Removing circuit

    If you mean those locking/snap-in buggers,they are a pain to open. Since they come in many sizes it will be hard to have a single tool to handle all. You can build your own(like you discrbied): A metal hollow tube 6-7" long , with an inner diameter a-bit smaller than the drilled-hole in the PCB...
  16. dorke

    Why won't my TI CD4098B multivibrator give me a pulse

    Yes, 555 timer, CD4047, 74HC123, Schmidt trigger gates, etc. In your "per-modified original circuit" the mono-pulse is created by a manual switch without any relation to the photo-tr. What is it your are trying to do? Where do the "outputs" connect-to/activate? Is this pulse for generating a...
  17. dorke

    Optocoupler delay off MOSFET solenoid

    Oscar, If we go to the beginning,in order to be able to help you with the best solution. A few questions: 1. What is creating the "5V signal"? a photo? 2. What is the connection to the Laser shutter ? Is the solenoid an integral part of the system or something you added? a photo of the...
  18. dorke

    Learning electronics with python is good or bad ?

    Yes absolutely!!! Python for high level ,and C for "manipulating " Hardware. I find C much more difficult for newbies than Python . The interface to the Hardware for a programmer is through the "register map" approach(and interrupts) . About learning electronics, That is a totally different...
  19. dorke

    Learning electronics with python is good or bad ?

    How does learning Cricket with Field-Hockey sounds to you? They do have something in common... a ball and something to hit it with;)
  20. dorke

    Why won't my TI CD4098B multivibrator give me a pulse

    Apart from not leaving inputs floating, which you shouldn't do,as was said above by @Harald Kapp . Why do you connect /Q to -Tr (pins 9 and 11) ? This will cause a "locking state", that is why your circuit doesn't work.:( i.e once /Q will be "low" you have a "state lock". From that point...
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