dmm

[ayesha siddique]

i have to make a digital multi meter.i am in 5th semister.i dont know how to builad its circuit and how to programm it.plz help me???

[arun]

yes i can help u…….. to construct dmm but first u decide whether u need to use programed or descrite one..

[ayesha siddique]

i dont need programmed dmm…..i need the discrete one…..

 

[ayesha siddique]

i dont need programmed dmm…..i need the discrete one…..

 

[ZOBI]

This circuit is a circuit diagram  digital voltmeter with LED display. It’s ideal to use for measuring the output voltage of your DC power supply. It includes a 3.5-digit LED display with a negative voltage indicator. It measures DC voltages from 0 to 199.9V with a resolution of 0.1V. The voltmeter is based on single ICL7107 chip and may be fitted on a small 3cm x 7cm printed circuit board. The circuit should be supplied with a 5V voltage supply and consumes only around 25mA. The use of 7805 5V voltage regulator is highly recommended to prevent the damage of ICL7107, 555 ICs and to extend the operating voltages. The following is a schematic drawing:

 

 

Parts list of The Digital LED Voltmeter:

R1 = 8K2 R1 = 8K2
R2 = 47K / 470K R2 = 47k / 470K
R3 = 100K R3 = 100K
R4 = 2K R4 = 2K
R5, R6 = 47K R5, R6 = 47k
R7 = 0R / 4K7 R7 = 0R / 4K7
R8 = 560R R8 = 560R
C1,C5, C6, C8, C9 = 100n C1, C5, C6, C8, C9 = 100n
C2 = 470n / 47n C2 = 470n / 47n
C3 = 220n C3 = 220n
C4 = 100p C4 = 100p
C7 = 10-22u C7 = 10-22U
D1, D2 = 1N4148 D1, D2 = 1N4148
IC1 = ICL7107 IC1 = ICL7107
IC2 = NE555 IC2 = NE555
OPTO = CA 10 pin FTA = CA 10 pin

 

[ZOBI]

try this link also

 

http://www.electronics-lab.com/projects/test/001/index.html

[ZOBI]