Published:2011/6/16 5:55:00 Author:John | Keyword: direct conversion receiver
The following figure shows DCR front-end circuit based on TDA-7000 according to Daulton's design. This circuit is designed similarly as others because it also uses the balanced front-end circuit. Besides, internal oscillator has been used as variable frequency oscillator (VFO), just like the typical NE-602 design. The subsequent circuit is similar to typical NE-602 design. But the biggest difference is to use TDA-7000's internal op-amp to provide active band-pass filter.
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Published:2011/6/16 0:17:00 Author:John | Keyword: direct conversion receiver
The figure below shows the design of Dillon. NE-602's push-pull output (referring to the simultaneous use of pin 4 and pin) is utilized, which is more advanced than the single-ended output. Dillon points out that the balanced output enhances performance, especially for the inhibition on AMBOB breakthrough. Meanwhile, the helpful device for the AM break is the 0.47μF capacitor across the NE-602 output ends.
NE-602 direct conversion receiver complete circuit (View)
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Published:2011/6/16 0:12:00 Author:John | Keyword: Direct conversion receiver
The figure shows the simplest form of NE-602 DCR basic circuit. There are multiple structures of the input parts and local oscillator partial circuits. The figure shows the most common one. Output signal is led from pin 4 or pin 5 and is feedback to the audio amplifier. This circuit can work but not be recommended, because the circuit will be relatively with large noise and image signal and no filtering.
Figure: NE-602 Direct conversion receiver partial circuit (View)
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Published:2011/6/16 0:05:00 Author:John | Keyword: filter
In order to overcome the impact of AM break, several different measures can be used. Among them, the direct conversion receiver is well isolated to eliminate the antenna effect in the circuit conductors. Even so, coaxial cable can be used between the DCR printed circuit board and the antenna connector. Despite of the isolation methods which do not influence the signal on antenna itself, the input signal should be subject to at least a few LC filter network. Filter network can be not only a band-pass filter which can pass certain frequency through the spectrum but can limit other frequencies, but also can be tuned into a single frequency.
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Published:2011/6/21 0:43:00 Author:John | Keyword: automatic and fog lights
Mazda 95TAURUS (with DRL) automatic and fog lights circuit is shown.
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Published:2011/6/21 0:44:00 Author:John | Keyword: E-turn
Mazda 95TAURUS E-turn circuit is shown.
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Published:2011/6/21 0:33:00 Author:John | Keyword: engine performance
Mazda 96TAURUS (3.4L, SHO) engine performance circuit is shown.
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Published:2011/6/21 0:34:00 Author:John | Keyword: charging system
Mazda 95TAURUS (3.0L) charging system circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: Electronic instrument panel
Mazda 95TAURUS (3.0L) Electronic instrument panel circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: air-conditioning fan
Mazda 95TAURUS (3.0L) air-conditioning fan circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: cruise control
Mazda 95TAURUS (3.0L) cruise control circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: dashboard
Mazda 95TAURUS (3.0L, SHO) dashboard circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: dashboard
Mazda 95TAURUS (3.2L, SHO) dashboard circuit is shown.
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Published:2011/6/21 0:35:00 Author:John | Keyword: air-conditioning fan
Mazda 95TAURUS (3.0L, SHO) air-conditioning fan circuit is shown.
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Published:2011/6/21 0:36:00 Author:John | Keyword: lamp monitor
Mazda 95TAURUS (3.2L, SHO) lamp monitor circuit is shown.
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Published:2011/6/21 0:36:00 Author:John | Keyword: ABS
Mazda 95TAURUS (3.2L, SHO) ABS circuit is shown.
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Published:2011/6/20 8:18:00 Author:Lucas | Keyword: Programmable , signal generator, SCM
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Published:2011/6/21 0:29:00 Author:John | Keyword: dashboard lighting
Mazda 96TAURUS dashboard lighting circuit is shown.
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Published:2011/6/21 0:30:00 Author:John | Keyword: electric roof
Mazda 96TAURUS electric roof circuit is shown.
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Published:2011/6/21 0:30:00 Author:John | Keyword: front wiper washer
Mazda 96TAURUS front wiper washer circuit is shown.
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