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Staigen
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Posts posted by Staigen
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Hehe, ok, i did not thougt of that it was a reversible DC motor ??? :) :D ;D
//Staigen -
Can be done in an another way! Bye using a pair of diodes in series with the input of the LM317, also use emitter resistor for the PNP, the diodes should also be paralelled with a resistor!
//Staigen -
Hehe, nice!
//Staigen -
Hi
Awful lot of connecting wires on that motor ???
//Staigen -
Hey, you can use a PNP transistor to increase the current! I belive there is a description in the datasheet, or was it in the application notes for the LM117/217/317. Look!
//Staigen -
Ok Audioguru! Wich one of the LM317:s are identical to the LM117?
//Staigen -
There is something strange here, some dont have any trouble and others have!
When i was away for several weeks last year, i belive it lasted over the year change, i could not access E-lab either, and that lasted for several weeks! And i could not get in contact with any of you either, via email or chat! That reminds me, i have to save Mixos e-mail-adress.
Hey, Ante and Audioguru, cant you send me an e-mail, so i have your adresses, if something like that happens again? The adress is [email protected]
//Staigen -
I haven’t noticed any problems whatsoever!?
Well, you seems to be the lucky guy here, many others seems to have problems!
Is it anyone else that have problems? Please report here!
//Staigen -
Hi there Ferocactus, velcome to the forum :)
Can I replace it with a 220 ohm resistor?
Of course you can, but, as far as i know, the resistor should be 120 ohms for the LM317! The 240 ohms resistor is for the LM117! Look in the datasheet!
//Staigen -
I meant that the server is overloaded, it can be more than Electronic-Lab that resides there. Or maybe it is not serviced properly. Or, as you say, Audioguru, the site is restricted sometimes.
At least i got Mixos e-mail adress. ;D ;D
Hey Mixos, do you know anything about this?
//Staigen -
I belive it is overloaded! Also, im almost sure the site was on a diffrent server for a while last sunday!
The IP-number is(or at least was last sunday) 204.157.9.58
I do a tracing again!
Its seems to be the same! 204.157.9.58
But, at at least one time i run a tracing last sunday it was not that IP-number!
//Staigen -
Oh NO! Now the problems seems to start again! Maybee the server isn't stable?
//Staigen -
Hi there Audioguru
so I was e-mailing most people I know
You can send me an e-mail too, if you wish :)
The adress is [email protected]
Hi hotwaterwizard
I wonder what's happpened? It happend on sunday, first it became very slow, so i run a "tracert" and was also pinging the server, but that did not gave anything. The same happend the last time i disapeared for a while, and i could not reach the electronics-lab for several weeks, i tried almost every day! But, suddenly it came back again. ;D ;D ;D
To Mixos!
What is your e-mail-adress, if this happens again, i can e-mail you and maybee help? You can send it as a personal message or as an e-mail to me.
//Staigen -
Hey
Now it seems to work again! ;D ;D ;D
//Staigen -
Hi
Now it is my turn to have problem accessing electronics-lab.com! I dont know whats wrong, and run a tracing to get an answer, but it did not give anything, maybee the server is overloaded. I send a textfile so you can see.
//Staigen -
Hi Shahriar
As I Know, they send digital Data!
If you mean the intercoms i talked about, there isn't anything digital there, they come in the 1960:ies or so, and used AM in the beginning, and later FM, because of much noice and interference. And they used freqs around 100-200 Khz! They where fully analog!For modulating Sound, I think 100Khz for carrier frequency is a little low, Isn't it?
No, even 100 Khz works just fine, it was not hifi! For hifi you maybee must go up to at least 400-500 Khz.
//Staigen -
Hi
I'm putting a NTC controlled cooling fan
Run the fan at full speed all the time instead, i suppose it is a fan from a computer.How much less power? Can we calculate that?
Audioguru is much better in calculating this kind of things. We can ask him.
Hey Audioguru, what do you think?
//Staigen -
Hehe, heatsink was the name for it, but it slip my mind, when i needed it! ;D ;D
I belive i'm getting old ;D ;D ???
//Staigen -
If you gonna use as for a guitar amp the put the output transistors on a real BIG cooling flange(i dont remember the right name for it now, this was in my dictionary)
//Staigen -
Hi Mickey
It will work, but, yes, it will deliver much less power!
And the BDW83/84 C transistors will also work!
//Staigen -
Hehe, something for you Shahriar! Cheap, simple and dirty! Only a few Cmos gates! ;D ;D ;D ;D
Hehehe
//Staigen -
Hi there
I checked the voltage of the BDW 83/84 transistors and the C stands for 100V collector voltage and the D stands for 120V collector voltage!
This means that either the C or the D verson can be used in this cirquit!
Mickey, the tranny shall be a 2X28V/8A type, not a 2X23 Volt type! 3X4700uF/63V lytics will be just fine!
I have not built this amp, and will never do, there are better amps!
//Staigen -
Hi Shahriar
Isn't this similar to the intercom system that used mains as transmission line?
They usally used 100 Khz, 120 Khz and 140 Khz as comunication frequency.
I reparied one such intercom once.
//Staigen -
Hi
Is the tranny rated for 18 Volts CT @ 45 Amps or 36 Volts CT @ 45 Amps? ???
Of course it is a 36 Volts CT tranny, but the schematic dont says that! ;D
Hey, thats a 1620 VA tranny, a real big one! ;D ;D
//Staigen
LM317 Variable power supply
in Projects Q/A
Posted
Also look at my reply's, they are simpler, uses only one IC. For 10 Amps use several transistors, and reduce the current thru LM317 to somewhere around 100 mA before the transistors start to conduct. Restrict the current thru the transistors to 2-3 Amps or so.
//Staigen