Free electronic circuit design and schematic diagram
This is a circuit of Power-Fail and Low-Line Signals. This circuit is used to warn the processor when the power failure or a brownout is occurs. The processor will enter a power-down routine, when either of those signals interrupts the processor. Back up important data prior to the POR placing the processor in reset and cease its current activities are […]
Read moreThe configuration in the circuit diagram below can be used when a slow rise time of the output voltage is required. We can find the rise time with following formula: ton= CVoR 0.45 Capacitor C is discharged when the switch position is ON and this will maintain the voltage at pin 2 low. The Vo follows the voltage at pin […]
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It’s good to reduce the power dissipated by the device. Using resistor connected in series to the input (the left figure) is a simple and economic method to reduce the device input-output differential voltage. Here’s the formula for calculating R: R= [Vi min- (Vo+Vdrop)]/Io Vdrop = minimum differential voltage between the input and the output of the device at current […]
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The diode-OR connection is the simplest link between backup battery and a main supply with a load. But, when the battery voltage is greater than main supply voltage, it will not work. To solve this problem we can use the circuit below. Here is the circuit : This circuit has the backup supply of 9V battery and main switch-mode supply […]
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There are two types of highly integrated boost converters, the TPS61081 and TPS61080. Both of them require low input voltage of 2.5V and the output is adjustable up to 27 V. The TPS61080’s current limit rating of the integrated power switches is 0.5 A and 1.3 A for TPS61081. Here is the circuit : It is useful for industrial application […]
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The development of miniature low-power (<2-W) DC/DC converters is growing rapidly because of the hot growth in distributed-power architecture. This application minimize the converter’s impact onboard space. This device is very useful for safety-critical applications such as medical equipment, and telecommunications, and industrial applications because it provides point-of-use isolated power conversion for analog circuitry. In addition, this device can be […]
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This a a simple circuit for precision current sink. This circuit uses two kinds of transistor, 2N2219 bipolar transistor and 2N3069 JFET because both of them have inherently high output impedance. Here is the circuit : To provide feedback to the LM101 op amp, this circuit uses R1 as a current sensing resistor. The true current sink nature of this […]
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