No problems connecting two supplies backwards - but in series. I recommend it all the time. If one is 1amp and the other 500mA, you can only draw up to 500mA. And the voltage will be the difference between the two.
The same applies when connected in series. The max current is 500mA and the...
A meter that consists of a coil and pointer is called a MOVEMENT. And it has a certain sensitivity. Generally the sensitivity is 30uA or 10uA.
For a movement with a sensitivity of 30uA, it will take 30 microamps to defect the pointer full scale.
At this stage you cannot use the term OHMS PER...
In my article on soldering I mention a few new points.
Firstly, the solder bought from China is not 60/40 It does not melt. It does not run. It does not produce a shiny joint and it produces a shocking result. DO NOT USE IT.
Secondly, there are two techniques to soldering.
One is to select...
If you are winding on a bobbin with sides, there are few problems. If you winding on a core with insulation between the layers, the problem comes when finishing a layer. The wire will fall off the end and get wound around the machine. Then all the turns will come off the layer.
Also thick wire...
It is best to hand wind the turns because you can then maintain the correct tension. You can buy a counter from a toy shop for a few dollars. Or keep count.
Unless you are an absolute expert, a coil winding machine will drive you insane.
You set the whole circuit up with an isolation transformer
Connect a 3 watt night-light as the load
Now short between base and emitter and the lamp should turn ON.
Now
"Well, that's what my fluke meter tells me."
It's a FLUKE they work at all.
You have to remember, when there is a high frequency in a circuit, these high impedance meters do not work at all.
A TV technician came to me 40 years ago and said there was positive on the grid of the 6CM5 valve via...
You can't have 16.7v across the resistors and 12.7v across the 1k because the transistor is turned ON and all the leads are at the approx same potential.
"A 1N4007 diode is rated for 1000 V PRRV, peak repetitive reverse voltage. It is NOT NOT NOT a zener diode of any kind. "
Of course it is a 1,000v zener diode. What do you think it is??????
"In a circuit like this that has no external earth ground reference, it is NOT the case that the N wire...