another breadboard voltage regulator

morris4019

So I have built a small module for my breadboard, using a lm317, but for my current application space on the breadboard is slim pickins. Until i can drive down to Fry's for another (cause its a ways away), I went to radio shack looking for a voltage regulator, specifically a 7805, that i could plug in to my breadboard. They did not have any, but gave me a 3055T instead, and told me that was a similar product. I've tried hooking it up the same as a 7805, but can't seem to get any flow out of it. Did radio shack get me for $3? Is this even a similar part?

The back of the package says, with the heat sink down, the order of pins are 1. Base 2. Collector 3. Emitter... On a 7805 I should plug say 9v + to pin 1, 9v - to pin 2 and also to - on board, and pos(+) on board to pin 3. I've tried many times and can't figure this one out. Maybe i just got sold the wrong part.

-Mike

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SRLM

Here is the datasheet for the 3055T: http://www.dl2jwl.de/pdf/mje2955.pdf

It appears that the shack guy didn't have a clue (as you should probably expect). Probably thrown off by the package style, which isn't limited to just regulators.

kwinn

They got you. A 3055T is a power transistor.

morris4019

Weak... Well, it was only a few bucks, no worries. You know i did bring up a similar datasheet on this and I have never actually used a Power Transistor, what exactly does it do?

-Mike

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SRLM

A transistor that can handle lots of current... You could use it (probably in a Darlington array setup) to power a large load.

kwinn

You could use it as a regulator also with a zener diode, transistor, and resistors.

morris4019

Thanks guys! I finnaly went down to frys... they seem to be the only people around that i can get the right parts when i need them, even if it is a 30mi drive. Anyway, I·made this little guy for my breadboard.

It uses a 9v batt at the moment, but can handle a max of 37v. ON/Off switch controls power to whole board at once. Multiple sockets - Direct 9v power with on/off and indicator, and by using 2 voltage regulators (a 7805 and a NTE962) i have another switch which controls the other sockets for a regulated 5v (1amp) power source or a 6v power source. Both with indicators.

by the way... first time using the predrilled plated circuit boards from radio-shack.

-Mike

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Post Edited (morris4019) : 5/5/2009 3:08:39 AM GMT

SRLM

I'd suggest ordering from online sources like mouser or digi-key. Prices are about 5x less per component (that's a guesstimate), so you can stock up on what you need for pretty cheap.