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Index 27

Audi computer data chart

Published:2011/6/25 10:33:00 Author:John | Keyword: computer data

Audi computer data chart
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Audi gated light circuit

Published:2011/6/25 10:20:00 Author:John | Keyword: gated light

Audi gated light circuit
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Audi active canopy opening circuit

Published:2011/6/25 6:10:00 Author:John | Keyword: active canopy

Audi active canopy opening circuit
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RMS voltage detection circuit

Published:2011/6/25 6:06:00 Author:John | Keyword: voltage detection

RMS voltage detection circuit
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Audi (without DRL) external light circuit

Published:2011/6/25 5:52:00 Author:John | Keyword: external light

Audi (without DRL) external light circuit
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mixer based on LM-1496 circuit

Published:2011/6/19 7:40:00 Author:John | Keyword: mixer

The picture shows the basic LM-1496 mixer circuit. In the figure, RF and carrier input are connected together to form a single-ended structure. Respective signals are sent from the input end through the DC blocking capacitors C1 and C2. Respective pin is connected to the ground through capacitors C3 and C4. Broadband output network includes a 9:1 RF transformer. The two outputs are combined together and their impedance is down to 50Ω. Transformer primary coil resonates the IF frequency through C5. figure: mixer based on LM-1496 circuit (View)

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Double-balanced diode mixer circuit

Published:2011/6/19 7:20:00 Author:John | Keyword: diode

Double-balanced diode mixer circuit
The circuit uses a ring diode mixer with balanced input, output and LO ports. It can achieve isolation between ports of 30 ~ 60dB. In the actual circuit, characteristics are also very good. Double-balanced mixer shown in the figure is widely used in a variety of designs by electronics enthusiasts and amateur radio enthusiasts. Such designs are the direct conversion receiver, single-sideband transmitter and high-performance short-wave receiver. If it is designed well, just a double-balanced mixer can work within a very wide frequency range. (View)

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Duplex filter electric appliance circuit

Published:2011/6/19 7:13:00 Author:John | Keyword: Duplex filter, electric appliance

Duplex filter electric appliance circuit
There are two tasks for duplex filter: ① to absorb unwanted mixer output signals so that they do not reflect back to the mixer; ② to send wanted signals to the output. In the figure, these two functions are achieved by two different LC networks. One is a high-pass filter and the other one is a low-pass filter. The assumption differential frequency signals in the circuit is what we need, so a high-pass filter (it’s half-power’s frequency is higher than the differential frequency) is used to guide frequency signals (that refers to the signal combination of RF and LC in the mixing process) to effective load R1. (View)

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duplex filter for direct conversion receiver circuit

Published:2011/6/21 0:08:00 Author:John | Keyword: duplex filter, direct conversion receiver

Duplex filter for direct conversion receiver circuit is shown. (View)

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JFET double-balanced mixer circuit

Published:2011/6/21 0:08:00 Author:John | Keyword: double-balanced mixer

JFET double-balanced mixer circuit is shown. (View)

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Eastcom EL610 cell phone failure repair circuit

Published:2011/6/21 0:09:00 Author:John | Keyword: cell phone

Eastcom EL610 cell phone failure repair circuit is shown. (View)

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NE-502 varactor tuning input circuit

Published:2011/6/19 5:09:00 Author:John | Keyword: varactor, tuning input

NE-502 varactor tuning input circuit
The following figure is a tuning input circuit which achieves tuning function by variable voltage capacitance diode (varactor). The total tuning capacitance in parallel consists of adjusting capacitanc C1, fixed capacitanc C2 and varactor diode’s junction capacitance D1. The total tuning capacitance is connected with transformer secondary coil L2 in order to form the resonant circuit. In order to reduce the impact of the series combination of capacitor C3/CD1, setting value of capacitor C3 is usually larger than that of the diode. In other cases, in order to make the diode capacitance become a part of resonant circuit’s capacitor, the value of capacitor C3 is very close to that of the diode. (View)

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Mazda 95TAURUS (3.2L, SHO) air-conditioning fan circuit

Published:2011/6/21 0:36:00 Author:John | Keyword: air-conditioning fan

Mazda 95TAURUS (3.2L, SHO) air-conditioning fan circuit is shown. (View)

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Mazda 95TAURUS (3.0L, SHO) lamp monitor circuit

Published:2011/6/21 0:36:00 Author:John | Keyword: lamp monitor

Mazda 95TAURUS (3.0L, SHO) lamp monitor circuit is shown. (View)

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cascode amplifier active preselector circuit

Published:2011/6/17 4:50:00 Author:John | Keyword: cascode amplifier, active preselector

cascode amplifier active preselector circuit
The following picture shows the circuit with a cascode VHF pre-amplifier formed by two pieces of JFET. (It means that Q1 is the direct coupling between the input common-source connection and the output gate connection Q2). In order to avoid the occurrence of self-oscillation circuit, the capacitor (NEUT) is inducted. Capacitance value is tuned to ensure that oscillation would not occur in any frequency circuit of the band-pass. In general, the circuit can be adjusted to a single channel through L2/C1 and L3/C3. (View)