24v - 12v

148

03:22:43

Reg

published 5 years ago

Robert_Kidd

5 years ago

Good start. All circuits need a reference point, ground, to run in EC. It can be anywhere in circuit but it makes most sense to connect it to DC source negative terminal. Now circuit will run.

Robert_Kidd

5 years ago

A couple of other points. The default LED current in EC is 20mA and the volt drop across them is set at 2.0V In real life you may want to use a different current as LED’s are very bright these days. Suggest you up it from 1k to 1.2k.

Robert_Kidd

5 years ago

You’ll notice that you lose about 0.7V across the base emitter junction giving you around 11.3V with a 12V zener diode. As you have plenty input voltage you can bump the output up by adding an ordinary diode in series with the zener diode. Make sure it’s anode is at top as you want it to conduct :-)

Robert_Kidd

5 years ago

EC zener current is set at a slightly odd value of 13.6mA. In real life you might want to check the specification (data) sheet for the zener you use. Here, adjust the collector base resistor to 1.2k to achieve 13.6mA, approx.

Robert_Kidd

5 years ago

Finally, a voltmeter is a very high impedance (resistance), in EC it is ‘perfect’ so has an infinite impedance. That’s why you’ll see there is no current down through it and the diode. I’d remove both. If you want to monitor output voltage just touch (to highlight) the output terminal, then touch the eye symbol below. Now when you start the simulator you’ll be monitoring the output on oscilloscope at top of screen.

Robert_Kidd

5 years ago

Finally, you may want to add a load across the output. Don’t know what current you intend to draw from your circuit but perhaps add a 180 Ohm resistor. Hope all this helps.

Robert_Kidd

5 years ago

Useful hint: If you want an extra component touch the ‘+’ symbol. The simulator will stop running to allow you to add it to the circuit. To add or change the wiring connections you need to manually stop the simulator first.

Nuffz

5 years ago

Thanks for the advice. The voltmeter is just to show where the output will be. Its only going to be used to charge a laptop so I don't need high current

Robert_Kidd

5 years ago

Depends what you regard as high current I suppose. Some laptops require 2A.

Nuffz

5 years ago

do you think this circuit can handle 2a?

Robert_Kidd

5 years ago

Not a chance.

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