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Multi-channel pressure XMD diagram

Published:2012/12/7 1:19:00 Author:Ecco | Keyword: Multi-channel, pressure XMD

Multi-channel pressure XMD diagram
It uses multi-chip MAX1457 to match with single-chip A / D converter and SCM, then they constitute a multi-channel pressure XMD, and the circuit diagram is shown in Fig. In the figure, it uses 8-to-1 analog switch CD4051 to receive up to 8-channel sensor signals. Each sensor calibration coefficients are stored in the 93C66. CD4051 output connects to ICL7135 - 4 1/ 2 single-chip A / D converter, then it can 41 / 2 digit LED display by decoder driver(CD4511) and bit driver (MC1413). (View)

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Tms320f2812 dsp controller - based electric circuit diagram

Published:2012/12/7 0:58:00 Author:Ecco | Keyword: dsp controller, electric

Tms320f2812 dsp controller - based electric circuit diagram is shown in figure. (View)

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Two kinds of output switching power supply circuit diagram

Published:2012/12/7 1:24:00 Author:Ecco | Keyword: output , switching power supply

Two kinds of output switching power supply circuit diagram
As shown in figure, it is a high-power switching power supply with L4970A. L4970A is a high-power single-chip switch integrated voltage regulator, the chip uses SIP-15 package, which is characterized by: ( 1 ) Input voltage must be > 11V, and the value is typically between 15 ~ 40V; ( 2 ) Output voltage: Fixed output is 5.1V, and it can also be set through an external circuit adjustable output with the range of 5.1 ~~ 40V; ( 3 ) the maximum output current is 10A; ( 4 ) operating frequency is 200kHz; ( 5 ) internal undervoltage detection, brownout reset power stage soft start circuit. (View)

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Step-up switching regulator power supply circuit

Published:2012/12/7 1:41:00 Author:Ecco | Keyword: Step-up , switching regulator , power supply

Step-up switching regulator power supply circuit
In the circuit, It uses transistor BG1 as a switching adjust tube; operational amplifier IC1 constitutes the compare amplifier; 555 time-base circuit is connected as astable multivibrator. Oscillator produces a sawtooth voltage on C1 (Vmin = 1/3Vz, Vmax = 2/3Vz, the frequency is determined by W1 and C1 ), then it is supplied to the noninverting input of the comparator IC1, sampling voltage is supplied to the inverting input terminal of comparator. The duty cycle of the rectangular waveform output by IC1 is decided by the sampling voltage, when the output voltage is a stable value, the sampled voltage is between 1/3Vz and 2/3Vz. (View)

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Optocoupler output mode circuit diagram of switching power supply

Published:2012/12/7 0:56:00 Author:Ecco | Keyword: Optocoupler , output mode , switching power supply

Optocoupler output mode circuit diagram of switching power supply
The PWRGD output port of power supply can display the input state of external power supply, and it is shown in Figure 1. (View)

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QRP SWR Meter With LED Indicator

Published:2012/12/6 20:21:00 Author:muriel | Keyword: QRP SWR Meter, LED Indicator

QRP SWR Meter With LED Indicator
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optional external 500mW 75m amplifier/filter

Published:2012/12/6 20:20:00 Author:muriel | Keyword: optional external , 500mW , 75m , amplifier, filter

optional external 500mW 75m amplifier/filter
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QRP 74 meter SSB Transceiver

Published:2012/12/6 20:19:00 Author:muriel | Keyword: QRP 74 meter, SSB Transceiver

QRP 74 meter SSB Transceiver
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SSB 75 Meter Transceiver

Published:2012/12/6 20:18:00 Author:muriel | Keyword: SSB 75 Meter, Transceiver

SSB 75 Meter Transceiver
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LC Bandpass Filters 3

Published:2012/12/6 20:17:00 Author:muriel | Keyword: LC Bandpass Filters

LC Bandpass Filters 3
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LC Bandpass Filters 2

Published:2012/12/6 20:16:00 Author:muriel | Keyword: LC Bandpass Filters

LC Bandpass Filters 2
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LC Bandpass Filters

Published:2012/12/6 20:16:00 Author:muriel | Keyword: LC Bandpass Filters

LC Bandpass Filters
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7.0-7.1MHz tuned gate VPA

Published:2012/12/6 20:14:00 Author:muriel | Keyword: 7.0-7.1MHz , tuned gate VPA

7.0-7.1MHz tuned gate VPA
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VPA High Pass/Low Pass Filter after Q1 Stage

Published:2012/12/6 20:13:00 Author:muriel | Keyword: VPA , High Pass/Low Pass, Filter, Q1 Stage

VPA High Pass/Low Pass Filter after Q1 Stage
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VPA With A High Pass Filter After The Q1 Stage

Published:2012/12/6 20:13:00 Author:muriel | Keyword: VPA , High Pass Filter, Q1 Stage

VPA With A High Pass Filter After The Q1 Stage
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broadband voltage probe RF preamp

Published:2012/12/6 20:12:00 Author:muriel | Keyword: broadband voltage , probe RF preamp

broadband voltage probe RF preamp
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Broadband Voltage Probe Antennas

Published:2012/12/6 20:11:00 Author:muriel | Keyword: Broadband Voltage, Probe Antennas

Broadband Voltage Probe Antennas
Figure 1 and Picture 1 shows the respective schematic and outcome for the first broadband version I constructed. This is similar to a version sold as a kit, except for the Q2 stage, which was added to decrease the output impedance to preserve the function of my receiver double tuned filter stage. (View)