The figure below shows the essential information about this window. You can type the Component that you want or go to the Group dropdown menu. The “Select a Component” window will open. For that, you can either go to Edit tab -> Component or press ctrl+w. Once you open Multisim, the first thing is to add the components. This circuit is usually used for a Lead-acid 12V battery. About how safe, efficient, reliable, etc, that this circuit is or could be? Could it be improved? Id like to add an indicator LED to light up for overcurrent/short circuit warning but Im still too dumb to figure out where and how to place it without breaking this circuit completely.In the figure below, we have a current controlled battery charger circuit using LM317. Now I would be grateful if someone with more insight and experience than me could comment on this circuit. At 100 ohms this circuit passes about 110 mA through U1.
R5 is shorted out (zero ohms) to test the circuit. The conditions for the circuit above is C1 is a small placeholder for the supercap, R4 is a placeholder load for a 32x8 (4x 8x8) LED matrix (or up to 6 of them), I measured a single element to draw ~60mA with "normal text" scrolling on it. So I found the evaluation copy of Multisim which allowed me to come up with this circuit that seems to work. At first I was trying to understand the article on wikipedia ( ) but didnt have much luck since I still dont have components to experiment with. Im especially worried about burning power supplies because my next expected shipment contains two 5V 5F supercaps. Anyways this got me interested in this current limiter circuit which I think could save me from some future losses. That was a sad moment not because of money loss but because getting new ones from china takes so damn long. Unfortunatly I quickly messed up and short circuited one (shorted the ICSP vcc-gnd pins).
My new favorite is the arduino nanos, so much versatility in such a cute little package. Then bought a 37 sensor kit, and now recently got another order delivered with a rbpi3, an (second) arduino uno, two arduino nano (v3), sd card readers, gsm module, 8x8 led matrix, etc. I started with a raspberry pi 2 and in the same order chucked in an arduino uno because they were so damn cheap. I did some as teenager but never got far, Im heavy into computers, low level programming, linux, etc, but got interested in raspberry pi and arduino lately. Im just starting to pick up electronics as a hobby again.
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