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difference between lm117 & lm317
That seems like a nice thread. However, since I don't really need it to output 5A or more I could just go with the original design. I'm guessing that the original is https://www.electronics-lab.com/projects/power/003/index.html.
There are two problems however...
variable power supply 0-30v diagram
Is Vi the input positive voltage and Vo the output positive voltage from the bridge rectifier. What happens with the negative?
Also, what is the thick black line that the capacitor and pin 4 of the LM741 connected to? Is that ground?
l200 current adjust
By "circuit 2" do you mean figure 2 in that PDF, the programmable current regulator? How exactly is it programmable? Also, I'm not sure how exactly these circuits will work. What I envisioned is a power supply with two knobs. One to control voltage and the other to control...
lm117 lm317 difference
Do you recommend that I go with the 2xLM317 solution or that I use an L200 regulator?
Of course. That should have been obvious.
For that first link, will the circuit need to be modified to be used with US 120V/60Hz mains power? Obviously I would use the appropriate...
psu l200
But couldn't I just put a potentiometer on the output of the power supply to vary the current between 0 and 1.5 amps?
This document only mentions the LM117 not the LM317. Is that what you meant? What is the difference between the two?
I didn't find any good circuits for the L200...
l200 power supply
Thanks for the reply.
That first link is far too complicated. There's no way I could build that (now). However, I did look up the LM317 regulator. A lot of feasible schematics exist that utilize the LM317 (ie. **broken link removed**). That one says that the voltage is...
power supply l200
I'm looking to build a variable power supply for my second electronics project (the first being the transistor tester I inquired about here a few weeks ago). I'd like a few recommendations on what I should build.
So far I'm thinking that a 3-30 volt design (of which there...
Re: Transistor Tester
Well I could do that but then I wouldn't be able to use this solderless breadboard for any other circuit. Is there a type of board that would allow me to maintain (for the most part) the positioning of the elements on my solderless breadboard? Thanks.
Re: Transistor Tester
Aha! It works! Wonderful.
I've realized the problem. I had the collector and emitter inverted. Prior to hitting the switch, the tester will only tell you if the collector and base are inverted. Both LED's staying on when the switch is hit, then, either indicates a faulty...
Re: Transistor Tester
Ok I've breadboarded the circuit. I've checked and rechecked and every connection and they all seem fine to me. Both LED's stay on when the switch is not hit. According to the chart provided with the schematic, this means that the transistor under test is ok. However, when...
Re: Transistor Tester
Ok. I've found two ceramic capacitors labeled 103M in the value pack. My multimeter says they are 10nF so I guess I will try those but what does the M stand for? Why are they not just labeled 103 instead of 103M?
Also, I don't have a 3.9kΩ resistor (Rt in the circuit). Is...
Re: Transistor Tester
Thanks for the reply.
http://www.discovercircuits.com/PDF-FILES/xistrtst.pdf
I had already found this one. The problem is that it does not say that values of the elements. For example next to the capacitor it says 0.047. Is this in picofarads, nanofarads, microfarads...
Hi. I'm looking for a small transistor tester circuit. All it should do is tell if a transistor is PNP, NPN, and whether it works or not. Since I'm a beginner this should be very simple. Thanks.
Thanks for the replies.
IanP:
The image of the PCB layout is so small that I can't see make it out well at all. Any enlargement just blurs it so that it is just as difficult to make out. Regardless, unless I am mistaken, most circuits will only provide you with a schematic (and not a PCB...
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