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| CA3290_04 |
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 INTERSIL
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6 page 
6 constant to insure constant reverse voltage bias on the photo diode. Low-Frequency Multivibrator In this application, one half of the CA3290 is used as a conventional multivibrator circuit. Because of the extremely high input impedance of this device, large values of timing resistor (R1) may be used for long time delays with relatively small leakage timing capacitors. The second half of the CA3290 is used as an output buffer to insure that the multivibrator frequency will not be affected by output loading. RP is the parallel combination of the two 1MΩ resistors connected between +15V and GND. Window Comparator Both halves of the CA3290 can be used in a high input impedance window comparator as shown in Figure 7. The LED will be turned “on” whenever the input signal is above the lower limit (VL) but below the upper limit (VU), as determined by the R1/R2/R3 resistor divider. + - +15V A2 CA3290 7 6 5 +15V 3.3k Ω 60M Ω 1.0 µF 10k Ω 140k Ω + - A1 CA3290 1 +15V 1N914 8 4 0.01 µF 1N914 +15V 3 2 1M Ω +15V 15k Ω 1.5M Ω 2M Ω 15 k Ω C30809 X 60s TIME R1 R2 FIGURE 5. LIGHT CONTROLLED ONE-SHOT TIMER + - +15V A2 CA3290 7 6 5 3.3k Ω 1M Ω + - A1 CA3290 1 8 4 +15V 2 3 15k Ω 1M Ω +15V 20M Ω RP 1M Ω 1M Ω +15V 0.36 µF R2 1M Ω tPeriod 10s == t2R 1Clog e 2R P R 2 ------------ 1 + = R1 C FIGURE 6. LOW FREQUENCY MULTIVIBRATOR + - A2 CA3290 + - A1 CA3290 1 7 8 4 670 Ω 3.9k Ω LED 2N2102 2 3 6 5 R3 VL VU 100k Ω R1 100k Ω +15V +15V INPUT 47k Ω R2 47k Ω 6.8k Ω FIGURE 7. WINDOW COMPARATOR CA3290, CA3290A |
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