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  1. Herman the German

    MOVED: Controlling current through relay coils with resistors.

    This topic has been moved to [Circuit/General Requests]. because of hijacking another thread. http://www.electronics-lab.com/forum/index.php?topic=20960.0
  2. Herman the German

    Re: sensor circuit

    Hi Albert, you might substitute the photo transistor with a normal NPN transistor. Apply base voltage which will simulate the light passing to the photo transistor pulling the collector low. Switching the base to ground will then simulate an obstructed view switching the collector high. The...
  3. Herman the German

    New logic gate developed - norep

    ;DHey freaks, here is something you have been looking for to make your circuit unpredictable. A new gate JUX1-3 has been developed to overcome this problem. It is a perhaps-gate with a variety of functions. The IC is produced in a DIP-14 package and contains four identical gates. Technical...
  4. Herman the German

    Cont to 'n' and recycle

    ??? The decimal counter CD4017 can be wired not to count all the way up. However counting from zero to six and resetting with the output 7 it starts at one (zero almost omitted). Who knows the trick?
  5. Herman the German

    Marketing assistance

    Hello everybody, I am in close contact wiht a Korean producer of UV-LEDs. Since those people know how to produce the LEDs they don't know much about marketing. I sent them already a list of more than 1.000 German electronic suppliers and I am curious to know if there exists something similar...
  6. Herman the German

    Voltage-to-pulse-duration converter

    Hello everybody, I read an article in Philips application note (AN170, Dec. 1988) about an application to convert voltage to pulse duration - PWM. I tried the circuit with a simulator programme with the only difference using 2N2222 instead of a 2N3642. No matter which input voltage is applied...
  7. Herman the German

    Nixie tubes

    ??? Nixie tubes were a long time used before LED displays. Who knows a loacation where nixie tubes are still available? Kind regard to all Herman the German
  8. Herman the German

    AWG (American Wire Gauge)

    :-[ I have downloaded a programme calculating for voltage loss in any conductor. It seems helpful using it to design PCBs and the traces. However I do not quite understand which numbers I need to put in fora standard PCB with a copper layer of 35 micrometers. Is there somebody who can put the...
  9. Herman the German

    Suppliers for Laser TX and RX diodes

    :( Checking at semiconductor companies such as Motorola, Texas Instruments, Siemens, SGS-Thomsen (ST) does not show that they are producing laser equipment. Who knows where to get such devices?
  10. Herman the German

    Software Digital Works

    I have downloaded Digital Works lately but I can't get through to download a registered version of the programme. Using the URL I usually get redirected to another and there is nothing to find concerning "Digital Works". Using the email address the email is returned for unknown address. Who...
  11. Herman the German

    Precise rpm at changing loads

    ??? I got an old 3 1/2 inch disk drive and of course I want to use some parts of it. The most interesting part however is the small stepper motor (bipolar). Connecting it to the shaft of another motor will produce voltage output on the two output coils which can be converted to digital and be...
  12. Herman the German

    Constant rpm with tacho-generator

    ::)I found a strong DC motor which I want to use to drill PCBs. It has a tacho-generator output which I think can be used to automatically control a preset rpm. On a varying load the motor rpm will decrease or increase. It should also be run on 24V for maxium power to give at least 20.000 rpm...
  13. Herman the German

    AWG?

    ??? I saw a schematic concerning HV generators. There was an old flyback transformer in the circuit and how to change it. The windings of the primary coil were 22AWG and 18AWG. Germans handle square millimeters and dia millimeter but no AWG at all. How can I convert AWG to metric? Greetings...
  14. Herman the German

    Timer

    Hello everybody, one of the forum members gave me this forums name to become a member. He thinks it will be helpfull for some of You having difficulties putting together an electronic device of a german kit concerning the language. I will be glad to help everybody out with translations and if...
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