Circuit Diagram

Differential Input Amplifier Circuit With Common-Mode Voltage Up To ±100V

Published:2011/7/16 8:59:00 Author:Robert | Keyword: Differential, Input, Amplifier, Common-Mode Voltage, ±100V

The picture shows the differential input amplifier circuit with common-mode voltage up to ±100V. In practical applications, sometime it needs the amplifier to have high common-mode voltage (±100V). For enhancement of this feature, it offen needs to sacrific some other features. The differential input amplifier circuit, which could achieve that the common-mode voltage is up to ±l00V, is shown in the picture. This circuit's voltage gain is only equal to 1. The circuit uses two common integrated single operational amplifiers 301. The table shows the 301 integrated operational amplifier's main parameters (typical value).   (View)

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Differential Output Amplification Circuit

Published:2011/7/17 8:21:00 Author:Robert | Keyword: Differential, Output, Amplification

The picture shows the differential output amplification circuit.   (View)

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Class AB Amplification Complementary Symmetry Circuit

Published:2011/7/15 20:08:00 Author:Robert | Keyword: Class AB, Amplification, Complementary, Symmetry

The picture shows the class AB amplification complementary symmetry circuit. The circuit picture shows the OTL circuit. The second picture shows the OCL circuit. These circuits have the following features: (a)By adding RB1, RB2 it provides a certain bias current to avoid the crossover distortion. (b)By adding diode D1, D2 it could make the B1 point and B2 point keep different voltage level in static mode and it could send the ui signal to the B1, B2 points successfully in dynamic mode.   (View)

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The inverter circuit 1

Published:2011/7/16 4:17:00 Author:Christina | Keyword: inverter

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The inverter circuit 10

Published:2011/7/16 4:17:00 Author:Christina | Keyword: inverter

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Sensor circuit 102: carbon monoxide sensor circuit

Published:2011/7/14 21:07:00 Author:zj | Keyword: Sensor circuit, carbon monoxide sensor

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Sensor circuit 103: Ion detector circuit

Published:2011/7/14 21:18:00 Author:zj | Keyword: Sensor circuit, Ion detector circuit

Note: T1 is transformer, *1 8Ω speaker; D1, D2, D3 are MUR1100; U1 neon. LT1073 is adjustable DC-D Figue 5-99 α, β, γ particle detector with 1.5V battery   (View)

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Sensor circuit figure 108: pH sensor measuring circuit

Published:2011/7/14 21:30:00 Author:zj | Keyword: Sensor circuit, pH sensor measuring

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Sensor circuit figure 109: pH sensor measurement compensation circuit

Published:2011/7/14 21:32:00 Author:zj | Keyword: Sensor circuit, pH sensor, measurement, compensation

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Sensor circuit figure 110: pH probe amplification circuit

Published:2011/7/14 21:34:00 Author:zj | Keyword: Sensor circuit, pH probe, amplification circuit

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The 485 interface circuit diagram

Published:2011/7/14 21:36:00 Author:zj | Keyword: The 485 interface

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Homemade VGA-TV interface circuit diagram

Published:2011/7/14 21:39:00 Author:zj | Keyword: Homemade, VGA-TV interface

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Video amplifier circuit

Published:2011/7/14 22:02:00 Author:zj | Keyword: Video amplifier

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Varistor circuit diagram

Published:2011/7/14 22:04:00 Author:zj | Keyword: Varistor circuit

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[165V.HID.PWM] half bridge driver module

Published:2011/7/16 4:01:00 Author:Christina | Keyword: half bridge, driver module

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50W DC converter

Published:2011/7/15 23:53:00 Author:Christina | Keyword: 50W, DC, converter

The control, adjustment, surveillance, and other functions are beared by the TDA4700, the output controls the push-pull stage, and the voltage is output by the transformer. The main technical data: Output voltage U1:20-28V(typical value:24V)Output voltage U2:0-5.25V(typical value:5V)Output current I2:0-10ALoad voltage adjustment rate:0.4%efficiency:72%Positive loss PVD:0.9WSwitch loss PVS=0.4WTotal loss PVD+PVS=1.3W.   (View)

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Transistor Relay Time-Delay Closing Circuit

Published:2011/7/17 0:56:00 Author:Robert | Keyword: Transistor, Relay, Time-Delay, Closing

The picture shows the transistor relay time-delay closing circuit. When it is connected to the power supply, the voltage on the 16uF capacitor would be 0V and the two triodes are all off and the relay has no action. As the 16uF capacitor charging, after some time, the voltage on it would get to high voltage level and the two triodes are all turned on and the relay would be closed after the delay time. The delay time could be 60s. The length of delay time can be adjusted by the 10MΩ resistor.   (View)

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Ringing type switching power supply constant current driving circuit

Published:2011/7/15 23:18:00 Author:Christina | Keyword: Ringing type, switching, power supply, constant current, driving circuit

In the ringing type switching power supply, the power loss of the driving circuit which supplies the base current to the switching transistor is very large. The voltage UB of the transformer coil NB must ensure the minimum input voltage of the switching transistor to make the fully conduction, and the voltage UB is proportional to the input voltage Vi. When the Vi increases, the driving current Id will increases too, but the base resistance Rb increases the power loss that has the square relationship with the increasing part of Id. When the driving current ID is increasing, the voltage stabilization diode subcircuit current will increase too, and this will cause the oscillation problem, in a certain period of time, the switch works, and in the next period of time, the switch stops working.   (View)

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Single Operational Amplifier Basic Subtraction Circuit Composed Of LM158

Published:2011/7/16 21:02:00 Author:Robert | Keyword: Single, Operational Amplifier, Basic, Subtraction

The picture shows the single operational amplifier basic subtraction circuit. To avoid the error caused by the bias current, it is required that the external circuit total resistance value of the operational amplifier's two input ports should be balanced. This circuit uses the element of LM158. It is a single-chip high-gain dual operational amplifiers which would work under a wide range of single power supply. Its power current would be small and would have no relations to the power voltage. The LM158's main parameters are listed in the table.   (View)

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Ringing type switch power supply power expansion method

Published:2011/7/15 22:54:00 Author:Christina | Keyword: Ringing type, switch, power supply, power expansion

In the simple ringing current-limit power supply circuit, in order to make the output voltage stable, we need to connect the voltage-regulator diode with the base electrode of the switching transistor VTl, so the output voltage can not be adjusted. In addition, if you want to increase the output power, you need to increase the driving current. At this time, if you decrease the output current, the subcircuit current of the voltage-regulator diode will increase. This will change the voltage stabilization value of the voltage stabilization diode, even more than the allowable value of the voltage stabilization diode. So in order to improve the output power, we can use the method of add a current expansion transistor which is as shown in the figure.   (View)

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