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  1. dorke

    Calculating the current in a network of impedance elements

    That is easy actually: You have 3 KVL loop equations : (1)-green, (2)-blue,(3)-purple In each loop equation . the left-hand side is the value of the "voltage source" in the loop and the right-hand side is the sum of the voltages on each component expressed in the form of Vzi=Zi * Izi (voltage...
  2. dorke

    what is this circuit for?

    Where do those out of the blue questions come from ?o_O Do you know what a transfer function is ? rhetorical question, you obviously don't. Google it or find a book, study about it and how to find it, then if you have specific question come back.
  3. dorke

    Current limiting value

    For the first time you connect a newly-build project . I would set the current limit at zero, then gradually make it higher till it gets a bit above what is required by the project (like Dave suggested). It may save you smoke,fireworks and devices....;)
  4. dorke

    Can anyone help identify this connector?

    What brand is the car? Anything written on the male or female connectors?
  5. dorke

    Transistors needed,

    Yes, "R" stands for the decimal point .
  6. dorke

    95020WP and 95128WT

    Sorry, but in life, nothing is 100% guaranteed.
  7. dorke

    Problem with DC

    The (-) of your adapter is connected to earth ground,that simple.
  8. dorke

    95020WP and 95128WT

    Your programmer should do everything. Just try it.
  9. dorke

    12V Rechargeble Fan Circuit Problem

    It is probably the worst dirt-cheap DMM sold worldwide, but it will do.
  10. dorke

    Converting dc to ac

    In very short: A power stage is a "block" that can deliver power i.e both voltage and current simultaneously to provide the required power of the load. It is constructed of power semiconductors devices and driven by an appropriate signal(non-power one). About your 10KW project, Not practical...
  11. dorke

    Inductive load control

    A simple light dimmer will cut "both halves". You should use 1000W or more.
  12. dorke

    Misprint HARMAN / KARDON Receiver?

    There is indeed an older HK3400 model (circa 1991) stereo receiver which looks different . You should contact Harman Kardon company for answers here
  13. dorke

    95020WP and 95128WT

    The devices are on the list of the TL866, They are write protected . You should only read the content of the device with the programmer, that should be simple,don't try to write to it just read.
  14. dorke

    12V Rechargeble Fan Circuit Problem

    What "little circuit" have you burnt? Do you have a DMM and know how to use it? There are signs of "rework/soldering" on the print, are these your doings?
  15. dorke

    2 motors pushing an object. 1 motor goes bad... other keeps going... object breaks???

    It is a power supply,it's shape an form doesn't change it's functionality. So it as a plastic box not a metallic one. Here is how you should test if is floating : With the adapter/P.S not connected to power. Measure the resistance between the DC (-) and the power connector(2 or 3 prongs). Start...
  16. dorke

    Converting dc to ac

    You remember your physics class very well. An oscillator is a "device" that will create an AC signal from a DC voltage. The think is, it can deliver very little power to a load. To make it into a power device a power stage is required. It is like your audio system, a power amplifier is needed...
  17. dorke

    Neon lamp for turntable repair

    You can solder the wires. There are 2 problems with that solution. 1. There are so many different Neon lamps with different voltages/currents and light brightness,since you don't know what is the part you have it may or may-not be the correct part. 2. The lamp body(and bayonet) will be...
  18. dorke

    Rotary switch - detect which connector??

    What sensors are you using? Why use a mechanical selector?
  19. dorke

    Testing Transistors With Digital and Analogue Multimeters.

    Like @duke37 said it is because the older Analog meters have the internal battery positive feeding the (-)black lead. Newer Analog Meters(and AVOs) and Digital ones have it connected the conventional way positive to (+)RED. So for analog meters you never know before you actually test the...
  20. dorke

    Neon lamp for turntable repair

    Hi guys, A note: The neon light in the turntable is used for stroboscopic adjustment of the plate's speed. The neon light will "flash" twice in each cycle (both on positive and negative parts),the "bumps" on the plate rim are made in accordance with that. Here is a circuit that can replace the...
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