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  1. Sukhbinder

    pioneer DEH-1590UB service manual

    any one having the service manual for the pioneer DEH-1590UB CD Receiver. thanks in advance.
  2. Sukhbinder

    pioneer MVH-1490UB service manual

    Looking for the service manual for pioneer MVH-1490UB. thanks in advance
  3. Sukhbinder

    DC Power Supply (5V 10A) - Questions

    I use a PC SMPS for all my high current projects that need a 5V supply at a high current rating. The SMPS rails are shortcircuit protected at each voltage, there can be some high frequency ripple but you can use additional filter caps for it (by the way the maximum ripple stipulated by the...
  4. Sukhbinder

    What do you mean by 3 1/2, 3 3/4 digits specs for a DMM

    Thanks for the help audioguru. I found the explanation for the 3 1/2 system and i've observed that it applies to all DMM with 1999 counts, it says that the first digit is a 0 or 1 because if we have a range of 0.999 then next range will be 9.999 and to measure 1.042, 0.999 is not adequate and...
  5. Sukhbinder

    What do you mean by 3 1/2, 3 3/4 digits specs for a DMM

    Some one asked me about the 3 1/2 , 3 3/4 specs for a DMM, i explained it as i found it in a book but i'm myself not completely satisfied with the explanation. Do any of you guys have a good explanation for the above. I do understand the digits specs like 1999, 3999, 5999, 79999 (as i have them...
  6. Sukhbinder

    Need part number for SMD with code 31-OQ

    I'm looking for the part number for the SMD component with the code 31-OQ written on it (the O and Q have a minus sign on top of them). Its a 6 pin device in a SOT 26-3 or SOT 363 package (not sure of the dimensions). it is used in the power supply section of a MP3 player circuit (seems like...
  7. Sukhbinder

    Variable supply using LM317 with 32Vrms transformer rating

    thanks for the alternate circuit. I seemed to have a 5V DC supply also from the same transformer (the windings are different) and i will use a ICL7660 to generate a -5 for the negative bias of LM317
  8. Sukhbinder

    Variable supply using LM317 with 32Vrms transformer rating

    Thanks for the inputs, The transformer that was in the supply earlier has taps: 0-9.5v: i'll use for the negative bias for bringing the o/p of LM317 to 0V 0-10.5v: use with a 7805 for 5V supply 0-11.5v: not used till yet (could use for supply for a panel meter) 16-0-16: use with 7815/7915 for...
  9. Sukhbinder

    Variable supply using LM317 with 32Vrms transformer rating

    We needed some variable power supplies back at my college where i teach and came across some old multi voltage supplies which were dead but the transformers were fine.  I planned to make a variable supply using the LM317 but the transformer has a winding of 32Vrms that i plane to use but 32Vrms...
  10. Sukhbinder

    diy 2.1 pc speaker

    If you can change the amp ICs being used, you could use the TDA8510J from philips. It is an amp designed for 2.1 speakers and is usually used in Creative 2.1 speakers. The amp has the specs of a 26W BTL + 2x 13W stereo channels. Here's what the data sheet says: The TDA8510J is an integrated...
  11. Sukhbinder

    Planning to get a new temperature controlled Soldering Iron

    Hi Guys, i have been using a 25W Solderon soldering iron for the past 15 years. i used a fine chisel tip with it, earlier i have been working with normal PCBs, but now since most of the PCB now have become more of SMD type and are much smaller in size, i am planning to get a new temperature...
  12. Sukhbinder

    microSD card (mp3 player with more memory) problem!!!!

    You cannot add a memory card inplace of the memory chip. the chip you marked is a flash memory chip which readily connects directly with the microcontroller (the other small square chip in the pic). try looking for the data sheet for the  microcontroller and see if it supports other storage...
  13. Sukhbinder

    USB on micro SD slot problem

    You cannot connect a USB drive on a microSD card slot. The specifications and format for a microSD card and USB interface are totally different from each other. A USB has just 2 pairs of terminals, one for the power (the two outer ones) and one for the data (the two inner ones). A USB drive has...
  14. Sukhbinder

    Power supply ignorance

    lab power supplies base on an SMPS donot have much of a surge rating for the current. if you drive a motor (especially a motor from a power tool) , the motor will appear as a short circuit for the supply and most of the time the supply goes into the current limiting mode. To drive heavy...
  15. Sukhbinder

    Hitachi oscilloscope CRT pinouts and specs needed

    We use a CRT setup as a part of our experiment for our students to calculate the e/m ratio of the electron. The experiment is usually referred to as finding e/m ratio using magnetic focusing. The supply to the CRT seems to have some problems and the setup is quite old and no circuit diagrams...
  16. Sukhbinder

    what's the difference between 1N5402, HER502, and FR502 diodes?

    Thanks HtG for the reply. I knew about the fast recovery diodes and their use but was a bit confused about the general purpose rectifier and high efficiency rectifier. May be the high efficiency rectifiers are more preferred in high frequency rectifiers (may be in a switched supply or so)...
  17. Sukhbinder

    what's the difference between 1N5402, HER502, and FR502 diodes?

    what's the difference between 1N5402, HER502, and FR502 diodes? The 1N5402 is a 3A 100V general purpose rectifier diode. The HER502 is a 3A 100V high efficiency rectifier diode. The FR502 is a 3A fast recovery diode. The fast recovery diode is used for damping the reverse EMF in relays or other...
  18. Sukhbinder

    For fun - What is your degree?

    Hi guys, I hold a B.Sc.(Hons) and M.Sc. degree in Electronics from the University of Delhi, INDIA. Currently I'm pursuing my Ph.D degree in electronics from the same. I'v been working on conducting polymers based devices specifically solar cells for my doctoral thesis for the past 3.5 years and...
  19. Sukhbinder

    mystery blue water from hydroxy gas exsperiment

    I agree with Ante, the green colour is most probable of Copper. All leads in diodes are made from copper with a tin coating on them to allow for easier soldering.  You can try evapourating the blue water as Ante suggested if if its copper you'll find greenish blue crystals of copper sulfate
  20. Sukhbinder

    Sony KV-LS21M80 21" CTV service Manual needed

    I tried Google for the service manual but all i could get were payed links. no free downloads. any help here guys ???
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