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  1. Proper thermal dissipation is an essential rule for nowadays electronics. The best operating temperature for the electronic components is 25 degrees (standard room temperature). Thermal dissipation in some commercial devices is not done properly which affects the lifetime and performance of the devices. So, embedding a compact automatic cooling Fan controller board would be useful. Also, it can be used to protect your own designed circuits and their power components, such as regulators, Mosfets, power transistors … etc. Previously, I had introduced a circuit to control the cooling fans, however, my intention was not to use any microcontroller and keep it as simple as possible. So, the device was a simple ON/OFF switch for the FAN, depending on the defined temperature threshold. This time, I decided to design a complete and more professional circuit to control the majority of the standard FANs (25KHz PWM) using an LM35 temperature sensor and an ATTiny13 microcontroller. I used SMD components and the PCB board is compact. It can control one or several standard 3-wires or 4-wires FANs, connected in parallel, such as CPU Fans. Moreover, the target device/component can be protected against over-temperature using a Relay. The user is also notified by visual/acoustic warnings (a flashing LED and a Buzzer). To design the schematic and PCB, I used Altium Designer 22 and the SamacSys component libraries (Altium plugin). To get high-quality fabricated PCB boards, you can send the Gerbers to PCBWay and purchase original components using the componentsearchengine.com. I initially tested the circuit on a breadboard. I used the Siglent SDM3045X multimeter to accurately examine the voltages and the Siglent SDS1104X-E oscilloscope to examine the shape, duty cycle, and frequency of the PWM pulse. References Ref: https://www.eeweb.com/pwm-cooling-fan-controller-and-over-temperature-protection-using-lm35-and-attiny13/ [1]: ATTiny13 datasheet: https://componentsearchengine.com/Datasheets/1/ATtiny13-20SSU.pdf [2]: 78L05 datasheet: https://www.st.com/resource/en/datasheet/l78l.pdf [3]: 2N7002 datasheet: https://datasheet.datasheetarchive.com/originals/distributors/Datasheets-26/DSA-502170.pdf [4]: 2N7002 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/2N7002/Nexperia [5]: L78L05 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/L78L05ABD13TR/STMicroelectronics [6]: ATTiny13 schematic symbol, PCB footprint, 3D model: https://componentsearchengine.com/part-view/ATTINY13-20SSU/Microchip [7]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [8]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions [9]: MicroCore board manager: https://github.com/MCUdude/MicroCore#analog-pins [10]: Siglent SDS1104X-E oscilloscope: https://siglentna.com/product/sds1104x-e-100-mhz/
  2. The high temperature of the power components is a known phenomenon in electronics. To overcome this challenge, the designers mount heatsinks on the components to dissipate the heat, however, in many commercial and home appliance devices, the embedded heatsink is not adequate and the air must be circulated faster to reduce the heatsink and component temperature, otherwise, the lifetime of the component is reduced significantly. The proposed automatic FAN controller board is simple, compact, and can be embedded inside commercial devices. The LM35 temperature sensor could be fixed on the heatsink using some silicon glue. The user can easily set the temperature threshold using a potentiometer. The board can be supplied using a 5V or a 12V supply, therefore a variety of 5V, 12V, miniature, and PC FANs can be used. I used Altium Designer 21 and SamacSys component libraries (SamacSys Altium plugin) to draw the schematic and PCB. Except for the connectors, all components are SMD and easy to solder. References Source: https://www.pcbway.com/blog/technology/Cooling_FAN_Controller_using_an_LM35_8d3d76cb.html [1]: LM358 datasheet: https://www.st.com/resource/en/datasheet/lm358.pdf [2]: SI2302 datasheet: https://www.vishay.com/docs/63653/si2302dds.pdf [3]: LM358 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/LM358D/STMicroelectronics [4]: Si2302 schematic symbol, pcb footprint, 3D model: https://componentsearchengine.com/part-view/SI2302DDS-T1-GE3/Vishay [5]: Electronic designing CAD software plugins: https://www.samacsys.com/library-loader-help [6]: Altium Designer plugin: https://www.samacsys.com/altium-designer-library-instructions
  3. Hi everyone. Can you help me with this circuit I am working on, please?. (Image 1) It consists of a TP4056 charger/controller connected to a 3.7v/1.4Ah Li-Ion battery to supply a low battery indicator and a load (3 leds + 2 fans) through a MT3608 Step Up to raise voltage from 3.7v to 9v. When the TP4056 is charging the battery through the USB port, the load is disconnected by the P-Mosfet. PROBLEM: Voltage drops significantly when the load is connected. Test1: Circuit without Debouncing/Load connected: Voltage drops from 3.68v to 3.46v (image 2). Low Battery Indicator: Blinks. Test2: Circuit with Debouncing/Load connected: 1) Debouncing Circuit: The voltage drops to 2.19v at the output of the Smichtt Trigger, therefore it isn't possible to energize the Step Up and the rest of the circuit. 2) Low Battery Indicator: Blinks when switch is pressed. Test3: Circuit with Debouncing/Load disconnected: 1) Debouncing Circuit: Works fine (image 3). 2) Low Battery Indicator: Doesn't blink when the switch is turned ON/OFF. Is there something that I am forgetting to put in the circuit so the voltage is dropping? I would suppose that the problem is at the DC/DC conversion of the Step Up, but everything is meeting its requirements (Vin:2v-24v/Imax: 2A). My system details: Power consumption: 1.702W Low Bat Indicator: (0.037W, 3.7v/0.01A) Load: 2 Fans (1.44W, 9v/0.16A), 3 Leds (0.059W, 2.92v/0.02A). Debouncing Circuit based on a Schmitt Trigger 74HC14 (Vin:2-6v/Vout:2-VCC, VCC and GND connected to battery line).
  4. Hi guys, I would like to ask your help. I would like to make an electronic circuit where it can detect the fan failure and indicates it with the light. The specs are as follow: -240VAC cooling fan (4 unit) -1 tower light (green & red) I want to make the light indicate green when all the fan are working but the red when 1 or more of the fan fault. Thank you guys for your cooperation. I really appreciate it.
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