Jump to content
Electronics-Lab.com Community

Sukhbinder

Members
  • Content Count

    199
  • Joined

  • Last visited

    Never

About Sukhbinder

  • Rank
    Advanced Member
  • Birthday 11/26/1978

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

  1. In Need of Sony KV-LS21M80 21" CTV service Manual. please post if any one has it.

  2. any one having the service manual for the pioneer DEH-1590UB CD Receiver. thanks in advance.
  3. Looking for the service manual for pioneer MVH-1490UB. thanks in advance
  4. 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 design specs is 1% of full voltage; i measured a ripple of 3-4mV in a 5V supply) to switch on a PC smps just connect the power On wire (green wire) to ground (black wire). the supply is in standby and when the green wire is open or connected to +5V.
  5. 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 in the 9.999 range the resolution is too bad and 1.042 cna be approximated as 1.03 or 1.05 but by using a half digit (0 or 1) the range is 1.999 and the next range is 19.99 so 1.042 can be satisfactorily measured in 1.999. however i can't seem to make out the logic behind the 3 3/4 digits as i have 3 D
  6. 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 on my DMMs) Thanks in advance
  7. 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 some kind of a switching supply regulator circuit). In the circuit this components keeps over heating and the battery drain increases considerably which reduces the operating time. Any idea what it could be. Any link or website where i can look for SMD codes? thanks in advance
  8. 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
  9. 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 +/- 15v 0-32v: planning to use for LM317 variable supply. I could use a lower winding but then the 0-32v goes un-utilized and there are no taps in it. thanks again ;)
  10. 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 means about 45V max. Can i use the LM317T for a variable supply, variable from 0V to say 30V. the data sheet specifies the max input-output differential as 40V for the LM317T? I was planning to use two LM317T's in series. the first can drop the voltage from say 45V to 35V along with a series pass tran
  11. 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 class-B output amplifier in a 17-lead single-in-line (SIL) power package. It contains a 26 W Bridge-Tied Load (BTL) amplifier and 2 x 13 W Single-Ended (SE) amplifiers. The device is primarily developed for multi-media applications and active speaker systems (stereo with subwoofer).so it simplifies the desi
  12. 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 controlled soldering iron. We have a distributor of goot products here. I tried finding about weller but no body stock them here due to high prices and less users for such quality tools. Actually there are a lot of cheap Chinese products available here at much lower prices. I found three models from goot,
  13. 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 media (and to what capacity).
  14. 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 an inbuilt interface chip with its own clock generating crystal and a flash memory chip. while a microSD card is just a flash memory without any supporting hardware. The supporting hardware for the memory card is on the host side. USB slots are more popular in devices because of the robustness of the de
  15. 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 inductive loads like motors u need an old fashioned transformer based linear suppl but they are expensive than the SMPS types. some times SMPS based supplies can work as a low cost alternative. in my case i needed a high current supply for my digital projects (voltages of 5V for logic and 12V for relays, et
×
  • Create New...