Electronic Circuits Schematics Projects




Demodulators


Lvdt-driver-demodulator

A very simple motion transducer can be constructed using the circuit shown. The output is biased to one-half the supply voltage. This requires special interface circuitry for the signal readout. One simple method is to use a zero center meter in a bridge configuration. Displacement now can be measured as a positive or negative meter reading. ..


Views: 9 | Votes: 5 | Comments: 0 | Rating: 2 | Rank: 5 | Added: Mar 2, 2013 |
FSK Demodulator/Tone Decoder with RC2211N

A monolithic phase locked loop for data communications. The IC contains a basic phase locked loop for tracking an input signal within the pass band, a quadrature phase detector which provided carrier detector and an FSK voltage comparator which provides FSK demodulation. In the circuit shown, the IC is used as an FSK demodulator such as would be found in the receiver circuit of a modem...


Views: 4686 | Votes: 28 | Comments: 0 | Rating: 2 | Rank: 10 | Added: Jun 9, 2012 |
no image available @low-cost optical tracker

A project required building a synchronous-demodulator circuit to track a line drawn on paper. The beauty of the synchronous-modulator/demodulator approach is its inherent noise rejection. The method rejects nearly all out-of-band noise, whether from internal drift or external illumination. This rejection is a boon in optical tracking, where the return signal is inevitably buried in 120-Hz ambient light, amplifier offsets, and temperature drifts...


Views: 2336 | Votes: 3 | Comments: 0 | Rating: 3 | Rank: 0 | Added: Dec 12, 2012 |
no image available @Tachometer demodulator has fast response time

When a tachometer is a critical part of overspeed-shutdown circuitry, the response time of conventional demodulators may be too long. The circuit in the block diagram in Figure 1 provides updated speed data. The circuit provides corrections for variations in excitation amplitude and frequency at every excitation half-cycle. The circuit is independent of processors and, therefore, immune to software- and bus-related failures...


Views: 3857 | Votes: 65 | Comments: 0 | Rating: 5 | Rank: 0 | Added: Sep 12, 2012 |
no image available @Demodulator makes low-cost optical tracker

A project required building a synchronous-demodulator circuit to track a line drawn on paper. The beauty of the synchronous-modulator/demodulator approach is its inherent noise rejection. The method rejects nearly all out-of-band noise, whether from internal drift or external illumination. This rejection is a boon in optical tracking, where the return signal is inevitably buried in 120-Hz ambient light, amplifier offsets, and temperature drifts...


Views: 2054 | Votes: 33 | Comments: 0 | Rating: 0 | Rank: 0 | Added: Aug 18, 2012 |
no image available @Increasing the Frequency Response of the ADXL Series Accelerometers

The ADXL series of accelerometers are specified and tested for operation over the range from dc to 1 kHz typically. However, in many applications, such as vibration monitoring, a wider bandwidth is required. The bandwidth of these accelerometers can be increased by decreasing the demodulator capacitance...


Views: 2375 | Votes: 4 | Comments: 0 | Rating: 1 | Rank: 0 | Added: Jun 22, 2012 |
no image available @The KD2BD Pacsat Modem

The KD2BD Pacsat Modem is a low cost, high performance 1200 bps BPSK modem designed to interface between a packet radio terminal node controller (TNC) and an amateur satellite ground station, and allows full-duplex access to the 1200 baud "Pacsat" constellation of amateur satellites. The KD2BD Pacsat Modem consists of a 1200 bit per second BPSK demodulator for receiving Pacsat transmissions, and a Bi-Phase Manchester encoder for generating Pacsat uplink signals. The.....


Views: 5595 | Votes: 50 | Comments: 0 | Rating: 6 | Rank: 0 | Added: Apr 28, 2012 |
no image available @Demodulator makes low-cost optical tracker

A project required building a synchronous-demodulator circuit to track a line drawn on paper. The beauty of the synchronous-modulator/demodulator approach is its inherent noise rejection. The method rejects nearly all out-of-band noise, whether from internal drift or external illumination. This rejection is a boon in optical tracking, where the return signal is inevitably buried in 120-Hz ambient light, amplifier offsets, and temperature drifts. The circuit in Figure 1 is.....


Views: 4560 | Votes: 19 | Comments: 0 | Rating: 7 | Rank: 3 | Added: Apr 24, 2012 |
no image available @INFRARED MOTOR CONTROLLER

When the circuit is energised from a 6V battery, the decade counter CD4017 (IC2), which is configured as a toggle flip-flop, is immediately reset by the power-onreset combination of capacitor C3 and resistor R6. LED1 connected to pin 3 (Q0) of IC2 via resistor R5 glows to indicate the standby condition. In standby condition, data output pin of the integrated infrared receiver/demodulator (SFH505A or TSOP1738) is at a high level (about 5 volts) and transistor.....


Views: 2802 | Votes: 77 | Comments: 1 | Rating: 2 | Rank: 0 | Added: Apr 21, 2012 |
no image available @Demodulator makes low-cost optical tracker

A project required building a synchronous-demodulator circuit to track a line drawn on paper. The beauty of the synchronous -modulator/ demodulator approach is its inherent noise rejection. The method rejects nearly all out-of-band noise, whether from internal drift or external illumination. This rejection is a boon in optical tracking, where the return signal is inevitably buried in 120-Hz ambient light, amplifier offsets, and temperature drifts...


Views: 720 | Votes: 65 | Comments: 0 | Rating: 8 | Rank: 0 | Added: Apr 18, 2012 |
no image available @14MHz SSB 10mW transceiver

The whole Construction : You can call the transceiver like this as "OZL type". Characteristics of the "OZL type" are as follows. 1. Single conversion super. 2. Using two DBM-s as modulator and converter. 3. Modulator DBM is used as demodulator in receiving time. 4. All amplifiers are used in transmitting and receiving time. 5. Case is second use of my failed or useless machine.(This time I used my useless old 10W 7MHz transmitter.) 6. All decals are done with the.....


Views: 2003 | Votes: 38 | Comments: 0 | Rating: 2 | Rank: 0 | Added: Apr 9, 2012 |
 
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A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applic...

This is a circuit about PLL system that can be used to implement an FM demodulator. Since the VCO output tracks the FM signal, and the VCO input voltage is proportional to the VCO output frequency,...

A demodulator is a circuit that is used in amplitude, (maximize amplification capacity), modulation and frequency modulation receivers in order to separate the information that was modulated onto t...

A simple PLL FM demodulator circuit using IC XR2212 is shown here. XR2212 is a highly stable, monolithic PLL (phase locked loop) IC specifically designed for communication and control system applic...

The TBA120 Series ICs provide a high-gain limiting IF amplifier and a quadrature coincidence detector in one package. These ICs are primarily intended for extraction of TV intercarrier sound, which...

Last week we saw how a simple AM modulation takes place with your grandfather's radio. The radio broadcasting station has modulated the voice and music and has been transmitted via antenna. Now you...