Anyone who has made something, be it a fan switcher or LED driver can post their circuits or pictures here.
Lets start with the Hard disk bar graph
The worst thing about this meter is that after I built it, RobthePyro showed me a device (lm3914)that does all this in one go. Except for the input ofcourse which makes all the difference.
What you need:
1) Vero board. This is the stuff I built the whole circuit with. Communica sells this in single sheets. Their about +-R20 each.
2) Resistros. You will need 100Ohm per LED(depending on the current drawn per LED) , 1000Ohm (1kilo Ohm) also as many as you have LEDS. Then you will need 1 x 10kOhm Variable resistor and 1 x 100kOhm Variable resistor.
3) Your LEDS. I used 3mm Green LEDs that use 15mA each. So I was safe driving them directly from my Op-amps. If you use the same circuit as I did but with LED’s that need more current, you will need to add Transistors.
4) Op-Amps. I used LM258 dual op-amps. 5 of them will give you 10 usable Op-amps. Be careful with these and do not short them. They are not that friendly. OR you could replace all the op-amps with a lm3914.
5) Optional transistors. You can use BC639-25 transistors if you want to drive up to about 100mA LEDs but then do not go over 5V per transistor. If you require more info just PM me.
To build:
1) There isn’t really a recipe to build this but just make sure you do not have any shorts on the board. THAT is why you need the multimeter. On your meter there needs to be a continuity test (the setting which beeps when you touch your probes together)
2) You will need to know which wire goes to which pin. You will need the circuit for that and the following: Pin 1 – Output A
Pin2 – Inverting Input A (-)
Pin 3 – Non-inverting input A (+)
Pin 4 – Ground
Pin 5 – Non-inverting input B (+)
Pin 6 – Inverting Input B (-)
Pin 7 – Output B
Pin 8 – Vcc
3) After you build this PLEASE test for shorts again. You might think you are the shiz but really even I still make this stupid mistake. Overlooking something is easy when you work with Vero board.