LCDs tester


Posted on Sep 27, 2012

An LCD requires an ac electric field to excite the organic compound in the display. Applying a dc voltage could permanently damage the LCD. The circuit in Figure 1 is a simple configuration to test the performance of an LCD. The circuit produces biphase square waves with negligible dc content. The circuit is based on a CD40106 hex Schmitt-trigger inverter.



The buffers and drivers connect to test probes through 47-k series resistors, which protect the IC in the event of short circuits. With the component values shown in Figure 1, oscillator IC1A provides a square-wave frequency of approximately 45




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Mp pulse width control
Tone control
Night Safety Light For Autos
Melody Generator Circuit using UM66
LM3900 Audio Mixer Schematic Diagram
2 GHz CMOS Voltage-Controlled Oscillator with Optimal Design of Phase Noise and Power Dissipation
DC Motor Speed Controller
LM1801 smoke detector circuit design electronic project
METAL DETECTOR
Simple Two-Transistor Motorcycle Alarm
8W + 8W tube amplifier circuit



Top