Free electronic circuit design and schematic diagram
While keeping the oscillator frequency relatively stable, this 555 based PWM controller features almost 0% to 100% pulse width regulation using the 100k variable resistor. To give a frequency range from about 170Hz to 200Hz , the frequency is dependent on the 100k pot and 100n. You can see the charging and discharging of the 100n cap is done through […]
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The TPS2390 and TPS2391 integrated circuits are hot swap power managers. These devices are optimized for use in nominal -48-V system. These devices are build with supply voltages ranges up to -80 V. These devices also rated to withstand spikes to -100 V. They can be used to enable live insertion of plug-in cards and modules in powered systems in […]
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The HYM1422 is an integrated 2.7V to 12V hot swap controller. This device allows a board to be safely inserted and removed from live backplanes. This is achieved using a pass FET with a current control loop that using a sense resistor, we can monitor the input current. The board supply voltage can be ramped up at a programmable rate […]
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This is Positive Low Voltage Hot Swap Controller circuit with Power Limiter. This circuit gives intelligent control of the power supply voltage to the load during removal and insertion of circuit cards from “hot” power sources or a live system backplane. This circuit uses The LM25069 that gives in-rush current control to limit system voltage transients and droop. This circuit […]
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This is Versatile Boost Converter circuit using TPS108x. The TPS1081 has chosen because it is suitable for application that requires up to 20 V and 100 mA to drive each column of a passive-matrix OLED (PMOLED). the TPS61080 is suitable for application that requires less than 10 V and only tens of milliamps per column for the active-matrix OLED (AMOLED). […]
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This is Positive High-Voltage Hot Swap Controller circuit with Power Limiter. This circuit uses the TPS2491 or TPS2490 because both of them have some advantages. The advantages of the TPS2491 and TPS2490 are positive high voltage, easy-to-use and has 10-pin Hot Swap Power Manager™ devices. 10-pin Hot Swap Power Manager™ devices will ensure the safety in driving an external N-channel […]
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We can make a very simple battery monitor using a dual-colour LED and a few additional components. When the red and green LEDs are illuminated, the LED produces orange. The following battery monitor circuit turns on the red LED below 10.5v. The green LED illuminates above 11.6v. The orange LED illuminates between 10.5v and 11.6v. This simple battery monitor circuit […]
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