Tools Calculators.

[tvtech]

Hi again,

Eric:
Oh that's great. But any reason why the current is now limited to 0.75 amps? Before it was 1.5 amps.

tmtech:
It's nice to know you tested these that much. I ran one hot a few years ago but never measured the case temperature. It always worked well though. I used it for simply regulating and adjusting the fan speed of a small DC fan.
Interesting article too, and they even mention Bob Pease and the LM337.

Pssd...not tcmtech. tvtech

Regards,
tvtech

 

[MrAl]

Pssd...not tcmtech. tvtech

Regards,
tvtech

Hi again,


Yeah hit the 'm' instead of the 'v', so i typed tmtech (but not tcmtech)...apologies
And it is fixed now...

 

[Mikebits]

It's about time you posted these in the tools section, I suggested that you do that eons ago.

 

[ericgibbs]

It's about time you posted these in the tools section, I suggested that you do that eons ago.

hi Mike,

I had to learn javascript, html and php coding first also ask EM to allow me access to the site software before I was able to do that.

If you have any suggestions for more tools/calc's please let me know.

Eric

OT:
Long time no see, hope you are well.
I was sorry to hear of your recent sad loss.

 

[Jaguarjoe]

Active filters?

 

[ericgibbs]

Active filters?

hi,
There is a very good free program already.

https://www.ti.com/tool/filterpro

E

 

[pebe]

The two circuits for 555 timers show VR1 that feeds the discharge pin, can be adjusted down to 10ohms. With a 12V supply that would almost certainly pop the internal pull-down transistor for that pin.

 

[ericgibbs]

The two circuits for 555 timers show VR1 that feeds the discharge pin, can be adjusted down to 10ohms. With a 12V supply that would almost certainly pop the internal pull-down transistor for that pin.

hi,
I would expect the user to have read thru the datasheet, however taking your point I have made the minimum setting as 100R.

Thanks for the input

E.

 

[Mr RB]

...
If you have any suggestions for more tools/calc's please let me know.
...

You don't seem to have a resistive voltage divider calc?
Ie; you input Vin and desired Vout and it tells what two value resistors are needed. It's a simple task for many, but is the kind of thing that newbies stumble with.

Also there are TWO versions there of LM317 calculators!

And using an LM317 as a current regulator is very common, even though it's just one resistor that sets the current limit maybe thats worth doing as a calc.

 

[captainkirksdog]

Ummm, is the chip in your 3915 tool supposed to be a 3914? That's what it shows.

 

[ericgibbs]

Ummm, is the chip in your 3915 tool supposed to be a 3914? That's what it shows.

hi,
Well spotted Capt.. its now fixed.

Many thanks... you must have a high power telescope to see that error from Uranus...

Eric

 

[MrAl]

Hello again,

Eric:
The LM317 calculator only goes up to 0.75 amps output now, what happened to the 1.5 amps output?

 

[ericgibbs]

Hello again,

Eric:
The LM317 calculator only goes up to 0.75 amps output now, what happened to the 1.5 amps output?

hi Al,
Try it now.
E

 

[tvtech]

Hi Eric

I really like what you have done with the LM317 calculator. From practical use and reading temps etc. over Three years, I reckon you are bang on target .

Great tool.

Best regards,
tvtech

 

[captainkirksdog]

(3915 tool) Not being picky, but there's still two more. Noobs might get confused. Watts box, top half & PS volts, second half. BTW, I occasionally come back to Earth, right about when my beer is gone! And thanks for the cool tools!<ckd>

 

[ericgibbs]

hi,
I would appreciate any positive feedback and suggestions for this new tool.

Its purpose is to give students an insight into what the effect of changing component/parameter values will have on a 'general purpose' voltage regulator circuit.

https://www.electro-tech-online.com/tools/PSUCapV1.php

E

 

[tvtech]

Hi Eric

I like

Played around with it for a while trying different drop out Voltages, Currents etc and all looks good.

Regards,
tvtech