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HT9170 DTMF Receiver
HT9170 DTMF Receiver

Conversion of MMDS surplus for 2304 MHz
Conversion of MMDS surplus for 2304 MHz

... PLL and UHF Oscillator, The Xtal osc and multiplier chain is rather straight forward. When referring to frequencies assume a 144 IF with a final LO of 2160 mhz The UHF Oscillator Power is regulated +12 The xtal is at 90 mhz and in a oven. There are 3 doubler stages to get to 720 mhz. The doublers a ...
TOPIC 10 UPDATED Nov.2, 2005
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... Idea op-amp, the bandwidth is infinity, so that signal at any frequency can be amplified by the amplifier. Practical op-amp, the bandwidth is limited. That is, the gain is not uniform. ...
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... worthwhile to ask a question: Why is it that we cannot use a standard operational amplifier at the input of an ECG system? As we know, the input signal is very small, so any noise becomes significant. So while a simple operational amplifier could be used to amplify the input it would add too much no ...
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... shroud is soldered to full width pads on the main circuit board. The center of this shroud is attached to the fans at eight points. The high current ground path for the speakers now travels over the cooling fans through the shroud, which functions as a busbar. At the same time, these high current si ...
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... voltage are related by the a. capacitive resistance. b. capacitive reactance. c. capacitive impedance. d. capacitive inductance. ...
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Vocal Harmonizer and Vocoder

... The final design is a simple, fourth-order, "multiple-feedback" bandpass filter. The design was taken from Don Lancaster's Active Filter Cookbook on page 154. The transfer function for a single stage of this filter is straightforward to compute, albeit tedious. The result is -1/R1/C2 * s / (s^2+2/R3 ...
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... for. So the first set of circuits will be examples that achieve BW’s not found in ceramic filters at the IF used or a filter center frequency where no ceramic filter’s are available. After we get through the bandpass circuits we can move on to some more unusual circuits using the SA605. These are a ...
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... system provide valuable information in the analysis and design of transmission circuits. • Consider the low pass filter • Observe that – It passes only frequency below wc – The phase response is almost linear till wc ...
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... powerful DSP processor. Its innovative design delivers greater flexibility, higher reliability and lower latency than many other processors in its class. Adding the optional DSP expansion card increases signal processing CC-16 zone controller and CC-64 control center. power 300%. Sound contractors n ...
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... Congratulations, and thank you for your purchase of Incriminator Audio amplifiers. Like all of IA's products, the 20.1 series amplifier was designed with only one thing in mind.....Performance! The new 20.1 has been completely redesigned, and comes with many performance upgrades. The first and majo ...
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... Voltage Follower / Buffer Amplifier  High input impedance  Low output impedance  Voltage gain = 1 UNITY GAIN; ...
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... In 1975, Sterling Ball tested a Leo Fender bass design, the Stingray. This bass is regarded as the first bass utilising ‘Active’ electronics. Containing a 9v battery and a 2 band Equaliser, the bass outputted at line level removing the need for a DI box. Passive DI boxes were still used to convert t ...
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... also is K (ω) Tran. =1, but phase changes from 0 to   The main disadvantages of this device are as follows: 1. Low accuracy of the given controlled phase. 2. Limited function capability, this is connected with the fact that, in this phase shifter the ...
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Audio crossover



Audio crossovers are a class of electronic filter used in audio applications. Most individual loudspeaker drivers are incapable of covering the entire audio spectrum from low frequencies to high frequencies with acceptable relative volume and absence of distortion so most hi-fi speaker systems use a combination of multiple loudspeaker drivers, each catering to a different frequency band. Crossovers split the audio signal into separate frequency bands that can be separately routed to loudspeakers optimized for those bands.Active crossovers are distinguished from passive crossovers in that they divide the audio signal prior to amplification. Active crossovers come in both digital and analog varieties. Digital active crossovers often include additional signal processing, such as limiting, delay, and equalization.Signal crossovers allow the audio signal to be split into bands that are processed separately before they are mixed together again. Some examples are: multiband dynamics (compression, limiting, de-essing), multiband distortion, bass enhancement, high frequency exciters, and noise reduction such as Dolby A noise reduction.
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