Published:2009/6/24 3:51:00 Author:Jessie
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Published:2009/6/24 3:41:00 Author:May
This circuit takes its operating power from the telephone line BZ1 is a piezoelectric transducer. (View)
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Published:2009/6/24 3:39:00 Author:May
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Published:2009/6/24 3:49:00 Author:Jessie
An LM139 section can be used as a one shot (View)
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Published:2009/6/24 3:47:00 Author:Jessie
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Published:2009/6/24 3:33:00 Author:May
Sometimes called the JFET μt-amp, this circuit provides a very low power, high gain amplifying function. Since pt of a JFET in-creases as drain current decreases, the lower drain current is, the more gain you get. Input dynamic range is sacrificed with increasing gain, however. (View)
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Published:2009/6/24 3:31:00 Author:May
This circuit is high-input-impedance acamplifier for a piezoelectric transducer. Input resistance is 880 M, and again of 10 isobtained. (View)
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Published:2009/6/24 3:30:00 Author:May
It is possible to simulate the balanced per-formance of a transformer electronically with a different amplifier. By adjusting the presets, the resistor ratio can be balanced so that the best CMRR is obtained. It is possible to get a better CMRR than from a transformer. Use a RC4136 which is a quad low noise op amp. (View)
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Published:2009/6/24 3:29:00 Author:May
Typical component values are given for use at audio frequencies, where these circuits are used most often. The input and output phase relationships are shown. (View)
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Published:2009/6/24 3:40:00 Author:Jessie
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Published:2009/6/24 3:28:00 Author:May
Not much can be said about how the LM382 works as most of the circuitry is contained within the IC. Most of the frequency-determining components are on the chip-only the capacitors are mounted externally. The LM382 has the convenient characteristic of rejecting ripple on the supply line by about 100 dB, thus greatly reducing the quality requirment for the power supply. (View)
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Published:2009/6/24 3:35:00 Author:Jessie
This circuit will start with a slowly rising supply voltage waveform. (View)
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Published:2009/6/24 3:34:00 Author:Jessie
This circuit operates a 1.5 Vdc from source. (View)
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Published:2009/6/24 3:24:00 Author:May
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Published:2009/6/24 3:27:00 Author:Jessie
A positively charged anode wire attracts electrons and a negatively charged cathode attracts positively charged ions. The recombination of electrons and ions causes a current that produces a voltage pulse. The cathode is maintained at -500 V by a charge on the 0.1-μF capacitor.A beverage can forms the chamber, an aluminum can forms the cathode, and half cans form protective end covers. The amplifier circuit board is shown to the left of center. (View)
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Published:2009/6/24 3:25:00 Author:Jessie
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Published:2009/6/24 3:22:00 Author:May
Used when maximum input impedanceis required or the signal attenuation of the voltage divider volume controlis undesirable. (View)
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Published:2009/6/24 3:21:00 Author:May
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Published:2009/6/24 3:19:00 Author:May
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Published:2009/6/24 3:19:00 Author:May
This circuit operates from +5 V and uses a single op amp to deliver a full-wave rectified output of the input signal. (View)
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