[Stepdown Transformer Turns Vs. Ampere]

Thanks Harry A. I was really waiting for it. It is great you have book on Designing transformers. I will need help later. But my question is different. To make it easier let me clarify, so that one can understand better. Say you have to design a stepdown transformer. Specifications as under:

Input voltage- 230v, Output volt is 14v @ 650 mA. Core Area is 1.90 cm (tongue width) and 2.00 (stack height)

Now what will be the Primary Turns, Primary Current, Primary wire Gauge.

What will be the Secondary turns and Secondary wire gauge.

What is the Turns per volt.

How to choose wire gauge (enamelled copper wire)

My calculations says:

TPV: 12.73, PTurn-2929, STurn-178

Pri.wire gauge-38/39 swg; Sec.wire gauge-25/26 swg

Am I right or wrong?

Please suggest.

 

 

[Stepdown Transformer Turns Vs. Ampere]

In step down transformer is it that Ampere changes in accordance with Turns.

I mean to say that in the Table I found:  38 swg wire has 0.0365 amp @ 200 amp per square cm. and 3507 turns per sq.cm.

If i wind 4000 turns shall I arrive at 0.042 Ampere that means current increases with increase in Turns.

Raw Formula = (0.0365/3503) x 4000 = 0.0416

Please help am I right. This is required for small step down transformers from 300mA to 1 Amp. 

[Transistor Substitute.]

Thanks a lot for updates about transistor equivalent.. Keep it up.

Regards

[Transistor Substitute.]

Sir, 

Can anyone help me finding Replacement of Power Transistors;

2SD613 - NPN , 2SD633 - PNP both complimentary pairs 

2SD600  & 2SB631 both complimentary pairs

The above are used in power amplifier sections of Sonodyne Model SCR2061. The exact transistors not readily available in India.

Thanks in advance, 

Regards

 

 

 

[Installation - Free To Air Channels with Gardiner FTA Channel Receiver]

Dear All,

Can anyone guide how to install efficiently with Analogue Satellite Finder with Gardiner make FTA receiver. Stepwise instruction will be very helpful.

Thanks in advance.

electronics_shamim

[Radio Cassette Corder - Philips DR435 and AKAI AJ W239]

Dear All,

Can anyone help me find the above Schematics for Philips Two-in-One Indian origin Model: DR435 and AKAI AJ W239.

thanks in advance.

Regards
Electronics_sham
India
====

[National RX-CW55F]

Try for Panasonic having the same model no.

Regds

[PCB Design Software (Schematic Capture)]

Dear All,

Can any one help me for any easy-to-use PCB software with Schematic capture option and libraries (12 Pin SIP) for newbies.

Thanks in advance.

electronics_shamim
====

[Transformer]

It is a waste of "power" so generated by the tfmr i.e. 150KVA. If you have the requirement of 5 KVA then you can go for a 7KVA max. Is not it!!!

[Easy PCB Design Software (single & double sided)]

thanks. noted and downloaded.

regards
electronics_shamim
====

[Easy PCB Design Software (single & double sided)]

Hi everyone,

Can any one tell me site for downloading easy PCB design software or what is the easy PCB software available with basic computer knowledge ?

Regards,
electronics_shamim

[SANYO MCD 510K]

Dear All,

Can any one help me Schematic or Service manual for the model shown below"
SANYO Korea : CD Radio Double deck cassette recorder
Model: MCD 510K

Thanks in advance.

truly yours
electroncis_shamim
====

[Service Manual for SANYO MC-S680K, SONY FH-7MK-II, National RX-C46.]

Dear Mr. Sarma,

The site you advised is not free. There are so many paid sites wherein I have already located my requisite info. But, I want some free sites, whereby it can be helpful.

Please let me know if there is any free sites for service manuals.

Regards,

truly yours,
shamim
====

[Service Manual for SANYO MC-S680K, SONY FH-7MK-II, National RX-C46.]

Sirs,

I need the following Service Manuals. Any help from any angle is highly appreciated. I tried to locate in www.eserviceinfo.com, but failed. Moreover, in the forum also, response very poor. I find this forum very very helpful.

Herewith remain in anticipation:

SANYO MC-S680K
SONY  FH-150R  Home Audio
National RX-CW55 Two-in-One
SONY FH-55W        "      "
SONY CFS-B5S        "      "
SONY CFS-W365S  "      "

SONY  FH-7 MKII

Regards
Shamim
====

[National Stereo Radio Cassette Corder Repair guide.]

Dear Mr. Sarma,

Thanks for the efforts sending the photo of a 2-in-1, but not the one which I meant. It is black in colour and slightly longer (horizontally) and height is short. I will get the photo shortly. Donn't worry please. Bear with me for the time being.


regards,
shamim

[National Stereo Radio Cassette Corder Repair guide.]

ok pier. I will surely post it shortly.

regards,
shamimim_india.
====

[National Stereo Radio Cassette Corder Repair guide.]

Dear Mr. SVS Sarma,

I am very much thankful to you for the reply. I am at one with you. Accordingly, I have searched everywhere on the pcb or at the backside, but in vain. However, I can tell you that the radio section used the following ICs and I have already downloaded and have with me the datasheet. What i need is the functionality of the whole operations of selector mode switch, which only i can have it on the whole schematic.

The Circuit uses the following ICs in radio section:

LA 1185 + LA1260
BA 1332
Main AF Ampl: uses BA5406

I doubt whether the selector switch (Radio/Tape/Sleep) or band switch (FM/MW/SW1/SW2) has gone bad.

Are you staying at Banglore?

Please also advise where could I have the same and in which book, as you specified which is available in BPB publications. Since, you also belong to India, can u please help me. However, I am ready to pay for all that.

Thanks and regards,

Shamim_India.
====

[National Stereo Radio Cassette Corder Repair guide.]

Sirs,

Can any one help me tips for repair of National make Model No. mutilated form(not known), in which tape section works perfectly ok but radio section totally dead. I donot know exactly what to do, whether selector switch or Band selector switch or some other component gone bad, please advise .

Awaiting early reply,

regards,
Shamim_India.

[Gang specifications used in FM receiver.]

Dear Audioguru,

Yes, Sir. I am talking about the tuned ganged capacitor which you have clarified clearly which is 35 pf for 100 MHZ for FM requirement. I was also really expecting reply from you, which I got.

Nowhere in the gang cap. there is any mention about pf. how can we know it is of which type? However, some gang caps. have 4-adjustable nuts on top of it, what are they used for? Is it trimmer (antenna & oscillator)?

Thanks for the same.

Regards,
Shamim_India.

[Gang specifications used in FM receiver.]

Sirs,

Can any one tell me the Gang parameters required for in the FM receiver set. Can a AM/SW Radio set Gang be used in FM receiver set? Understand AM/SW gang has three terminals. 1st is meant for AM Antenna, 2nd (middle one) ground, 3rd one meant for AM Oscillator.

Any idea on this pls let me know?

regards,
Shamim
====

[Sanyo Model: MCD-510K CD Radio Cassette Recorder Schematic pls.]

Sirs,

Can anyone help service manual for the double deck CD Cassette Radio Recorder for SANYO Model: MCD-510K please? CD player malfunctioning and nearly dead. It Optical lense gives up after a while 1 sec. or so. reads table of contents starts playing sometimes, if plays only for a second and then gives up.

Mostly the schematic sites available are paid ones, not free. As I am from India, it is barely impossible to pay and get it at my hand.

Please help!!!

Thanks in advance.

Truly yours,
Shamim_India.
====

[Simple dB meter driver circuit.]

Sirs,

I wish to have still more simpler db/audio peak level meter which can be interfaced just at the output of of pre-amplifier wired around BC148, which I had seen some years back, but I do not have the Circuit. Any idea pls.? However, I am very thankful to RDL2004, who has guided me properly.

Thanks to Audioguru, who has been always kind to extend help.

Thanks to MP who keeps me updated on immediate response.

Regards,
Shamim_India.

[Simple dB meter driver circuit.]

Sir,

The reply posted by RDL2004 is the exact one which I wanted. A simple vu meter depicted therein by use of diodes is also fantastic. I wish to extend my sincere thanks to him for the efforts made to post me the same.

Thanks again with regards,
shamim_india.
===

[Free download sites for Stereo Radio Cassette Recorder Schamatic diagrams.]

Sirs,

Can anyone help me out finding out some sites where I can find a particular model of Japan origin schematic diagrams for stereo radio casset corder of different models. This is needed because, it is required since i am into the field of service & maintenance of these.

regards,
Shamim_India.

[Simple dB meter driver circuit.]

Sir,

I hope I have not clarified properly. Now to be clear I state like this:

Like in an analogue multimeter (the needle deflects, in terms of ohms measurement, voltage etc.). So, a dB meter or the so called vu meter is also like that, in which the needle deflects (dancing) in rythms in relation to the speaker sound. For each channel it is there in the front panel top right hand side mounted unto the tape deck.

I hope this time i have clarified you properly. Hope to receive a reply this time.

With regards,
shamim