Just goofing around with my new meter...

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I can have both done within a few hours of receiving the PNP transistors. WIll check the local Radio Shack to see if they have them.

Can I substitute the 2N3904 NPN's for the 2N1617's in the water heater element tester?

Also, part list for the wire identifier? Only the resistor values and type (1/4W carbon film) are known. TIA :)
 
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janagyjr said:
I can have both done within a few hours of receiving the PNP transistors. WIll check the local Radio Shack to see if they have them.

Can I substitute the 2N3904 NPN's for the 2N1617's in the water heater element tester?

Also, part list for the wire identifier? Only the resistor values and type (1/4W carbon film) are known. TIA :)
Click to expand...

Janagy


The transistor are just General Purpose switching I purchased all these parts from RS.

2n1617 and 2n3904 both are the same.

All my Resistors are 1/4 watt carbon at 5 percent tolerance.

You could get by with 20 percent tolerance but I would use 5 percent on all the bridge resistors.


Also on the wire Identifier I used a 12 pole rotary switch out of my junk parts.

I don't know if RS carries them or not?

I first built these things about 20 years ago they work fine.

The bridge wiring can be a little confusing just be careful.



I gave a plumber my water heater Element tester.

He couldn't get over how you could touch the leads together
and it wouldn't change the brightness of the LED unless it was a Element.


Good luck if you do decide to build them.


By the way Sparky the second Tuesday of next week will be fine, Glad you said
that because I'm tied up for the first Tuesdays for the next few weeks.:lol:


Thanks:Ronald :)
 
Thanks, changes noted. :)

I've got a few bridge rectifier packages in my parts bin, but even if I have to wire it from scratch I'm good. :) That's one thing I've had tons of experience with (in addition to my current schooling, I spent a year at ITT Tech in their Electronics Engineering Technology program). :)
 
janagyjr said:
Thanks, changes noted. :)

I've got a few bridge rectifier packages in my parts bin, but even if I have to wire it from scratch I'm good. :) That's one thing I've had tons of experience with (in addition to my current schooling, I spent a year at ITT Tech in their Electronics Engineering Technology program). :)
Click to expand...

Sounds like a winner

I'm having trouble wrapping my mind around redrawing the diagram with the rotary selector
switch would you please check this latest one to make sure I drew it right.


Please click here to check

Thanks:Ronald :)
 
Looks good to me. I think I'll stick with manual selection, though. :)
 
janagyjr said:
Looks good to me. I think I'll stick with manual selection, though. :)
Click to expand...

Those selector switches are fairly expensive and manual works just as good.

My first one was manual my last one was with the selector switch.

I'm opposite from everyone else I can breadboard a circuit with no trouble
but when I go to draw it I have a complete melt down.

Thanks Ronald :)
 
ronaldrc said:
Those selector switches are fairly expensive and manual works just as good.

My first one was manual my last one was with the selector switch.

I'm opposite from everyone else I can breadboard a circuit with no trouble
but when I go to draw it I have a complete melt down.

Thanks Ronald :)
Click to expand...

I've gotten quite good at both breadboarding and drawing. I guess when you have free-time...

jumper said:
If I build it in Multisims/EWB, do I get half credit?
Click to expand...

Real men use TinyCAD ;p
 
Place a clampmeter on any line of the supply to the lamp, capable of reading the expected range. Convert measured cold and hot current values to resistance values.

Regards
 
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