By Delton T. Horn
Delton Horn has been an electronics experimenter for over 18 years and has labored in quite a few fields as an electronics technician. he's now occupied as a full-time technical writer. All sixteen of those tasks have been extracted from six of his top tasks books at present released through TAB. those books are: 117Practical IC initiatives you could construct
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38 Table 7-2. Parts list for Fig. 7-7. 047 pF capacitor C2 500 nF electrolytic capacitor R1 R2 R3 25 K potentiometer 75 K resistor 10 K potentiometer in Table 7-2. Potentiometer Rl is a simple voltage-divider volume control. Potentiometer R3 is a basic tone control, making the high frequency roll-off characteristics of the circuit manually adjustable. Most serious phonograph applications require frequency shaping to provide the standard RIAA equalization characteristic. All commercially available records are equalized according to the RIAA standards.
05 mF 50 pF 10/iF as a blocking capacitor in this case). Because amplifier 2 in this chip is directly coupled to amplifier 1 and amplifier 2 is directly coupled to amplifier 3, the use of an impedance-matching resistor applied to amplifier 2 (or amplifier 3) requires the use of a blocking capaci tor in series with the resistor. The gain of the amplifier stage can be modified by the use of a series resistor in the input (Rl). This acts as a potential divider in conjunction with the effective input resistance of the stage so that only a proportion of the input signal is applied to the stage.
The LM380 is widely available, and it comes in two packaging styles, an 8-pin DIP and a 14-pin DIP. The pinout for the 8-pin version is shown in Fig. 7-1, while the 14-pin version is illustrated in Fig. 7-2. Notice that the 14-pin version does not have any additional pin functions. On both packages, only six of the pins are actually active. The remaining pins are shorted to ground and provide some internal heatsinking. Since the 14-pin LM380 has more heatsink pins than the 8-pin version, it can handle greater amounts of power with out overheating.