By R. M. Marston
One hundred ten built-in Circuit initiatives for the house undefined, moment version (Completely Revised) describes 5 forms of linear built-in circuits and a hundred and ten tasks during which those can be used. The e-book describes the common features of the 741 op-amp (with open-loop voltage achieve, enter impedance) and the range of how the place it may be utilized in simple linear amplifier purposes. the sort 555 timer is designed for precision timing purposes, monostable multivibrator, astable multivibrator, and Schmitt set off purposes. The XR-2206 i.c. can be utilized via the technician as an easy waveform generator or as a fancy functionality generator with quite a few modulation amenities. The LM380 i.c. is an easy-to use general-purpose strength audio amplifier. The technician can use it as uncomplicated non-inverting 2W amplifier, or along with a unmarried bipolar transistor, as a small child alarm. The 723 voltage regulator i.c. can be utilized in a number of fastened or variable voltage strength provide purposes. it may be used as a low voltage (2-7.2V) regulator and, if the technician modifies the circuit, it could actually produce variable output voltages. The e-book is appropriate for engineers, apprentices, technicians, and scholars of electric engineering or electronics.
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Additional resources for 110 Integrated Circuit Projects for the Home Constructor
CHAPTER 2 TYPE 555 TIMER APPLICATIONS The type 555 timer is a highly versatile low-cost integrated circuit that is specifically designed for precision timing applications, but which can also be used in a variety of monostable multivibrator, astable multivibrator, and Schmitt trigger applications. The device was originally introduced by Signetics, but is now available under the ' 5 5 5 ' designa^ tion from most other i x . manufacturers. e. has many attractive features. 5V t o 16V. s, low-power lamps, and high impedance speakers.
The basic Fig. 16 circuit can be usefully modified in a number of ways. Fig. 18, for example, shows how it can be made into a variable- 52 TYPE 555 TIMER APPLICATIONS frequency square wave generator by replacing R2 with a fixed and a variable resistor in series. P 555 OUT A TIMER 1N914 1 N 9 H 5 R, 100kn •01jyF 01/yF Fig. 19. Sfis to 750ns 5 T0 1 5 V + V E OUT Fig. 20. 2kHz Fig. 5/xs to 750/xs. Here, timing capacitor Cx alternately charges via Ri —R2—Di and discharges via R3—R4 —D2. Fig. 20 shows how the circuit can be additionally modified so that it acts as fixed frequency square wave generator with a mark/space ratio TYPE 555 TIMER APPLICATIONS 53 or duty cycle that is fully variable from 1% to 99%.
36 TYPE 555 TIMER APPLICATIONS T C ,CAPACITANCE-/uF As Qi cuts off it removes the short from timing capacitor C j , so Cj starts to charge exponentially towards the supply rail voltage until eventually the Cj charge reaches 2/3 Vcc . e. reverts to its low state. The monostable operating sequence is then complete. e. Fig. 3. 2, and C j = IJF. Fig. 001/xF t o IOOJUF and lk£2 t o 10M12. 2 or greater than 20MJQ, and capacitor must always be a low-leakage component. e. This facility enables the periods to be externally modulated or compensated.
110 Integrated Circuit Projects for the Home Constructor by R. M. Marston