By Kunsman C. H.
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Manhattan 1937-1st McGraw Hill. octavo. , 477pp. , illus. , index. VG, no DJ.
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Breadboarded test circuit. 43 Project 2. Reaction Speedometer audiofrequency oscillator made from another 555 timer and is practically the same circuit as the original 555 clock circuit shown in the main diagram. The output from the timer is fed into a piezo buzzer so that an audible tone will be heard as soon as the circuit is triggered. Triggering is accomplished via pin 4 and the resistors (R3–R5) that connect to the output pins on the 4017 decade counter. Project 2. Reaction Speedometer When you have verified the operation of the circuit and made any necessary modifications, you can move the components to a more permanent home on some perforated board for installation into a cabinet.
Project 2. Reaction Speedometer Figure 2-5 45 Project 2. Reaction Speedometer and work the switch with his or her thumb. I kept the tester’s switch on the main box, but the advantage to having both switches remote from the main box is that there will be no distractions as the tester flips the switch to start the LED sequence counter. regulator will not be working very hard at all. R1 and D1 are optional, but they do let you know when your project is switched on. Having an ON-indicator LED is nice, especially if there is no way to tell if your circuit is on when you put it away.
The four AA batteries shown in Figure 2-7 will give the circuit 6 V and run for a very long time because the unit uses very little power. Although most 74 series logic chips, like the 74HC4017, specify only 5 V, they usually will run with higher voltages, so 6 V is not a problem. For use with a higher-voltage battery, such as a 9-V battery, you certainly will need a regulator to reduce the voltage to avoid damaging the chip. Figure 2-9 shows the simple 5-V regulator made on a small bit of perf board and ready for use with any of the 5-V projects presented in this book.