Circuit Schematic Accurate Electronic Stopwatch using 1MHz Crystal

Timer. - This is electronic circuit schematic of Accurate Electronic Stopwatch using 1MHz Crystal like in Figure 1 below. In this circuit schematic the basic component used are 1MHz Crystal, 74390 ICs, 7490 ICs, and 74C926 ICs. 

In here we will give you global description about Accurate Electronic Stopwatch using 1MHz Crystal and then we will give you link to continue your reading from original source as external website.

Circuit Schematic

Figure 1. Circuit Schematic Accurate Electronic Stopwatch using 1MHz Crystal (Source: Electronicsforu)

Component Part

• 7490 IC
• 74C926 IC
• 7404 IC
• Resistor
• Capacitor
• 1 MHz Cristal
• Seven Segments
• Push Button
• 74390 IC

Description

Circuit schematic like in Figure 1 above is Circuit Schematic Accurate Electronic Stopwatch using 1MHz Crystal. Electronicsforu site describe that A 1MHz crystal generates stable frequency which is divided by two stages of 74390 ICs (dual decade counter) and another stage employing 7490 (decade counter) IC to obtain a final frequency of 100 Hz or 10 Hz. Due to the use of crystal, the final frequency is very accurate.

The output of IC4 (7490) is counted and displayed using IC5 74C926 (4-digit counter with multiplexed 7-segment LED driver). Due to multiplexed display the power consumption is very low. Switch S2 (2-pole, 2-way) is used to select appropriate input frequency and corresponding decimal point position to display up to either 99.99 seconds or 999.9 seconds maximum count.

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