Published:2009/6/25 21:41:00 Author:Jessie
Broad-tuned recelver demodulates the RF signal picked up by a loosely coupled wire placed near the transmitting antenna. (View)
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Published:2009/6/25 21:37:00 Author:Jessie
This design allows high frequency signal handling and high toggle rates simultane-ously.Toggie rates up to 1 MHz and MHz signals are possible with this circuit. (View)
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Published:2009/6/25 21:36:00 Author:Jessie
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Published:2009/6/25 21:36:00 Author:Jessie
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Published:2009/6/25 21:36:00 Author:Jessie
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Published:2009/6/25 21:35:00 Author:Jessie
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Published:2009/6/25 21:35:00 Author:Jessie
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Published:2009/6/25 21:35:00 Author:Jessie
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Published:2009/6/25 21:32:00 Author:Jessie
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Published:2009/6/25 21:32:00 Author:Jessie
Circuit using Optical Electronics opamps has high input imped-ance, high gain capability, and 100-W output capacity without use of transformers, for highfidelity audio circuits, cathode-ray deflection circuits, and servosystems. Output currents up to 10 A require heavy output wiring, large power-supply bypass capacity, and heavy com-mon ground point. Load is in feedback loop of opamp. Constant-current drive for load makes impedance matching to loudspeaker unnecessary.- A High Gain 100 Watt Amplifier, Optical Electronics, Tucson, AZ, Application Tip 10205. (View)
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Published:2009/6/25 21:22:00 Author:May
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Published:2009/6/25 21:32:00 Author:Jessie
2N5457 FET acts as voltage-variable resistor between differential inputterminals of opamp. Resistance vat-iation is linear with voltage over several decades of resistance, to give excellent electronic gain control. Values of resistors depend on opamp used.- FET Databook, National Semi-conductor. Santa Clara, CA, 1977, p 6-26-6-36. (View)
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Published:2009/6/25 21:21:00 Author:May
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Published:2009/6/25 21:31:00 Author:Jessie
Simple JFET inputcircuit is operated as source follower with bootstrapped gate bias resistor and drain to give maximum possible reduction in input capacitance. Used as unity-gain AC amplifier.- FET Databook, National Semiconductor, Santa Clara, CA, 1977, p 6-26-6-36. (View)
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Published:2009/6/25 21:21:00 Author:May
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Published:2009/6/25 21:31:00 Author:Jessie
This self-starting fixed frequency oscillator circuit gives excellent frequency stability. R1 and C1 comprise the frequency determining network while R2 provides the regenerative feedback. Diode D1 enhances the stability by compensating for the difference between VOH and VSupply. In applications where a precision clock generator up to 100 kHz is required, such as in automatic test equipment, C1 may be replaced by a crystal. (View)
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Published:2009/6/25 21:31:00 Author:Jessie
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Published:2009/6/25 21:20:00 Author:May
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Published:2009/6/25 21:20:00 Author:May
This circuit operates a relay each time a sound of sufficient intensity is made, thus one clap of the hands will switch it one way, a second clap will revert the circuit to the origi-nal condition. Q2 and Q3 form a Schmitt trigger. TheJK flip-flop is used as a bistable whose output changes state every time a pulse is applied to the clock input (pin 12). Q4 allows the output to drive a relay. (View)
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Published:2009/6/25 21:29:00 Author:Jessie
Circuit Notes
The MC1596/MC1496 makes an excellent SSB product detector. This product detec-tor has a sensitivity of 3.0 microvolts and a dynamic range of 90 dB when operating at an intermediate frequency of 9 MHz. The detector is broadband for the entire high frequency range. For operation at very low intermediate frequencies down to 50 kHz the 0.1μF capacitors on pins 7 and 8 should be increased to 1.0 μF. Also, the output filter at pin 9 can be tailored to a specific intermediate frequency and audio amplifier input impedange. The ernit-ter resistance between pins 2 and 3 may be increased or decreased to adjust circuit gain, sensitivity, and dynamic range. This circuit may also be used as an AM detector by intro-ducing carrier signal at the carrier input and an AM signal at the SSB input. The carrier signal may be derived from the intermediate fre-quency signal or generated cally. The carrier signal may be introduced with or without mod-ulation, provided its level is sufficiently high to saturate the upper quad differential amplifier. If the carrier signal is modulated, a 300 mV (rms) input level is recommended. (View)
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