Crystal Cell Research for Experimenter

[Pirate88179]

Hey... here's an idea I found for copper heat sinks for transistors... I hope my circuit will look that good! lol

Nice.  But unless they are pre 1982, they are copper plated zinc.  Hence the term "Zincolns" used by metal detectorists.

I make my heat sinks out of used adult beverage/soda cans.  I can cut them to shape, fold them over for added thickness, and then bend them into whatever I need.  This works really well with the TIP 3055s I used on the Jeanna circuit. (See photo)

Of course, the zinc pennies might also have high thermal conductivity...I have not checked that.

Just my 2 cents....get it?  Ha ha.

Bill

[tgraca]

Nice.  But unless they are pre 1982, they are copper plated zinc.  Hence the term "Zincolns" used by metal detectorists.

I make my heat sinks out of used adult beverage/soda cans.  I can cut them to shape, fold them over for added thickness, and then bend them into whatever I need.  This works really well with the TIP 3055s I used on the Jeanna circuit. (See photo)

Of course, the zinc pennies might also have high thermal conductivity...I have not checked that.

Just my 2 cents....get it?  Ha ha.

Bill

Damn that's ugly... I love it!

I am working with this type of 3055 for this project and will be pumping a max of 2.5 amps at 12 volts through it, which is well
below the rated voltage these are supposed to handle. With the coils I made yesterday, it will run at less than an amp, but I will test
this with a bunch of coils until I find what I like. I know the math, but I end up testing stuff to see if the math really works. And yes..
I still stick the knife in the socket once in a while to make sure that it really hurt last time!

Any idea how much current it takes to get these things warm and then hot at 12 volts?

[Pirate88179]

Damn that's ugly... I love it!

I am working with this type of 3055 for this project and will be pumping a max of 2.5 amps at 12 volts through it, which is well
below the rated voltage these are supposed to handle. With the coils I made yesterday, it will run at less than an amp, but I will test
this with a bunch of coils until I find what I like. I know the math, but I end up testing stuff to see if the math really works. And yes..
I still stick the knife in the socket once in a while to make sure that it really hurt last time!

Any idea how much current it takes to get these things warm and then hot at 12 volts?

I don't know how many amps it will take to generate heat.

Like you said...testing is the way to go.  Like TK said, there are tons of counterfeit components out there, especially the 3055 in this case/style for some reason.  I mean, there are so many fakes out there that the odds are very high against getting the genuine deal, even if it has a "brand name" printed on it.
(Just google counterfeit 2N3055 and you will be surprised)
So, unless you have opened one or two of them up to make sure, I would just test them as you suggested.  As TK pointed out elsewhere, you can get 5 totally different results using 5 of these fake 3055's.  There are Youtube videos on these copied components.

Good luck,

Bill

[tgraca]

I got a little impatient waiting for my 25 watt resistor and wound a coil as a resistor. It gets very hot. Tried several configurations today.
Have any of you guys successfully used a coil as a resistor?

[MarkE]

I got a little impatient waiting for my 25 watt resistor and wound a coil as a resistor. It gets very hot. Tried several configurations today.
Have any of you guys successfully used a coil as a resistor?

Wires work fine as resistors at low frequency.