| Part's
List:
|
1x - 220 Ohm Resistor
1x - 10K Resistor
1x - 15K Resistor
1x - 47K Resistor
1x - 100K Resistor
1x - 1M Resistor
1x 10K Pot |
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|
1x - 100pF Capacitor
1x - 10n Capacitor
1x - 100n Capacitor
1x - 220n Capacitor
1x - 470n Capacitor
2x
- 10uF
Capacitor
|
|
3x
- 1N4148 Diode
1x - ICL7107 IC
1x - 7660 IC
2x - MAN6910 2-digit LED 7-segment Display |
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| Technical
Specifications:
|
Supply
Voltage: 5V
Current Consumption: ~ 25mA
Measurement Accuracy:
199.9 V - 100mV Resolution |
|
|
|
About
this Circuit
| |
This
digital voltmeter is 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.
|
Construction
Notes
| |
Brightness of the LED display segments can be varied
by adding or removing 1N4148 small signal diodes that
are connected in series. Use two 1N4148 diodes for
higher LED display brightness.
The use of 7805 5V voltage regulator is highly recommended
to prevent the damage of ICL7107, 7660 ICs and to
extend the operating voltages.
220 Ohm resistor should be connected to the PIN 4
on the first LED display.
The voltmeter can also be configured to measure different
voltage ranges and display higher voltage resolution.
Replacing 1M with 100K resistor will allow to measure
0 - 19.99V voltages with 0.01V (10mV) accuracy.
|
| |
Use 10K potentiometer to set the reference
voltage between PIN 35 and PIN 36 of the ICL7107 IC
to 1V.
|
Seven Segment LED Display
Prototype Images
| |
PIC Volt Ampere Meter Kit
| |
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