By Delton T. Horn
Delton Horn has been an electronics experimenter for over 18 years and has labored in numerous fields as an electronics technician. he's now occupied as a full-time technical writer. All sixteen of those initiatives have been extracted from six of his top initiatives books at present released via TAB. those books are: 117Practical IC initiatives you could construct
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Additional resources for Delton T. Horn's All-Time Favorite Electronic Projects
9-3. Simple hi-fi tone control circuit. Component values are determined for a sup ply voltage of 32 volts. Potentiometer R2isthe bass control. Potentiometer RSisthe treble control. Components within the dashed outline comprise the tone control network. Hz and 10 kHz respectively in the extreme positions of the potentiometer. A (Baxandall) hi-fi tone control circuit associated with another type of op amp is shown in Fig. 9-3. ) The IC in this case is the CA3140 BiMOS op amp. The tone control drcuit is conventional and only a few additional discrete components are required to complete the amplifier circuit around the IC.
The LM380 is often used in inexpensive tape recorders and The input in this case is a ceramic cartridge. The parts list is given 37 Fig. 7-6. A practical audio amplifier circuit using the LM380. Table 7-1. Parts list for Fig. 7-6. Component Description Number LM380 audio amplifier IC Transformer—500 ohm:200 K IC1 T1 C1 R1 i 500 pF 25 V electrolytic capacitor 1 Meg potentiometer J Ceramic jscartridge T\ 1 R1 L + 18V ' r llCZ (8 0 r—O speaker) m Pig. 7-7. The LM380 is ideal for use in inexpensive ceramic cartridge phonographs.
The (RCA) CA3035 integrated circuit is just one example. It consists of three separate amplifier stages connected in cascade with a component count equivalent to 10 transistors, 1 diode, and 15 resistors. Each amplifier stage has different characteristics. The first stage, which can be selected by connections to pins 1,2, 3, 9, and 10 (see Fig. , ideally suited to connecting to a preceding transistor 26 R1—100 KQ R2—100 KG C1—10 jiF C2- 1 /iF C3—10 jiF Fig. 6-1. Utilization of the first amplifier in CA3035 integrated circuit by tapping pins 1,2,3, 9 and 10.