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  1. K

    NEC Rotery Switch

    I need some help as this part has no letters, numbers ect on it. This is a NEC amplifier and it is a two position switch except the wire hook up to mother board is a flat cable type that seems to be seperated into three different cables surrounded by black plastic. Can three wires be soldered on...
  2. K

    Potentiometer

    I have a NEC amplifier that I am working on and need to find a source of Data Sheet for ALPS potentiometers to identify the value and old part numbers. This is all there is on the pot. 305F & 250KMN. The reading I get is 195k but that is due to fact that the shaft is busted an cannot be...
  3. K

    Power Supply Question

    I down loaded interesting new power supply for pre amps, tone control purposes. Upon examining the schematic and board there is a difference in diode numbers. Could some one take a look at it and advise me if this power supply is a working design or not as I am new but know how to set up the...
  4. K

    Pspice

    I downloaded Pspice and it comes Zipped. How do I set it up to use? Do I need a windows emulator or DosBox? Can anybody help? Later on today I ran across a web site called faculty.physics.tamu.edu/duller/pspice/pspice71.html. On it was all the files of pspice and directions for installing the...
  5. K

    Capacitance multiplier Power Supply

    What I have is a idea I need technical advise about. Needs 36vdc @ 4A. Transformer in front of this board 24vac @ 5A. A normal power supply of same transformer Bridge rectifier and 4700uf @ 50wvdc comes out the end at 36vdc. How will these parts work out as I need help figureing out which...
  6. K

    Simulation of 12-Watt Amp Help

    AS a newbi to electronics I have a simulation question. Am I correct that total amps can be measured in attached circuit accurately? Schematic  called for 2 Amps but did not include RC circuit addition for hum problem. Transistors used were ProtoLab ideal as the program is limited in choices...
  7. K

    Tina verses Protolab

    Does anyone know these two programs as to which is better?  I need transistors single supply and op-amps all pass type for audio circuits mainly.
  8. K

    simulation help needed

    I downloaded tex off your site and opened it and nee a question answered. A error message that says A temporary file used fo intialzation could not be created or could not be written to, make sure the didectory path exists. I opperate on windows XP Professional 32 bit. How do I accomplish this...
  9. K

    Data Sheet Needed

    I need assistance with a dot matrix type board display marked as follows. LTAABO1M 101THAILAND. I need to figure out the legs of it to find a way to turn a 10 X 12 into a 10 X 10 for a Audio Logic Analizer.
  10. K

    Parts Identification Help Needed

    >:(I have a question I need assistance with conserning enclosed gif 1. The four parts surrounding the rectifier what are they and what is their function in this schematic. I am confused they look like resistors but are marked like a capacitor. 2. The two inductors Without a meter how can I...
  11. K

    Service Manuals

    http://www.electronics-lab.com/forum/index.php?action=post;board=14.0 Need assistance Findig out where to go fo two items: 1. Owners Manual for a EMCO Power Supply Model:PSV-5 2. Service Manual for Same. 3. Service Manual and schematic needed for A NEC Reserve 2 Model A-7E Amplifier. Where to go...
  12. K

    Electronic Circuit Help

    http://www.electronics-lab.com/forum/index.php?action=post;board=13.0 Newbi needs assistance with a DC-DC Converter kit that is defective in the required IC calls for a CD4001 with 14 pins and the board has only 8 pins. I desire to redo the board as it is deffective but do not have a schematic...
  13. K

    Oscilloscope info

    Where does someone go without info about equipment bought used lab type with no manuel ? 1 Power supply bought used 30vdc @ 5a. 2 I have to donate to any one who needs on a Tektronicx model # 7854 on my adobe if any body needs a 90.00 manual for free plus the posibilities of oter tecktronix...
  14. K

    New to electronics

    I need assistance with two transistors and info if data sheets are available. 1. MJE3055 Data sheet and MJE3055T Data sheet to see if they are interchangeable. 2. MJE2955 Data sheet and MJE2955T Data sheet to see if they are interchangeable. One other part a IC 1. L165 DATA sheet and L165H Data...
  15. K

    newbi to transistor numbers and letters after

    Can any body help a newbi to electronics with a clarification. I researched a part # IRF9540 with Digi key and got the result of  manufacture part # IRF9540NPBF. how do tellif it will work as i have the sme problem with other transistors pluss TL084 OPAMPS. The letters at the und make me unsure...
  16. K

    New to electronics

    New to electronics hobbiest needs help finding obsolete parts as my supliers cannot handle some parts. parts needed are in small quanties only. 1. MN3001 @ 2 pieces.  2. MK5025ON  @ 1 piece.  3. BC184L @ 6 pieces  4. BC214L These parts are just a start as there are others for projects. tanks...
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