Rajsbom
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Posts posted by Rajsbom
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On 3/7/2023 at 7:12 PM, Eric Seaman said:
I want to build an electronic circuit to convert an NTC 10 kiloohm (B=3950) signal into an output voltage that can supply 2-3 amps. The output voltage should correspond to the measured temperature (4V at 25°C to 12V at 50°C), i.e. have a range of 4V to 12V DC. Is this typically done with a buck/boost converter and a coil and capacitor? Or is there a ready-made chip that I can use to achieve a maximum output voltage of 12V DC? The power supply comes from a PC power supply (12V DC). The purpose of the circuit is to control the speed of one or more DC fans using a changing operating voltage at the fan, without using PWM. To linearize the NTC and process the voltage, I was thinking of using a TLV9002 from TI. Can anyone help me with the rest of the circuit? No programming, no software, no Arduino, no PLSOC, just more or less classical built up with only a few compenents. Is that possible?
You may use adjustable Voltage DC-DC converter such as LM2576-ADJ, LM2596-adj , play with NTC + Divider Resistor at feedback you may get it
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This inductor is made using POT Core, value Approx. 640uH to 680uH will work, current could be 100mA,
you may try Drum Core Coil from Mouser Part No 80-SBCP-80HY681H
https://www.mouser.in/ProductDetail/KEMET/SBCP-80HY681H?qs=pfd5qewlna7zBsC5r9mWjg%3D%3D
Or you may make one using POT Core, Value approx. 680uH , Current 100mA or less
https://www.digikey.com/catalog/en/partgroup/p-core-type/50202
Assistance with the voice changer using AP8072 IC
in Projects Q/A
Posted
HI,
Voltage @ Pin 11 and 12 should be 4.5V, if not then check
If zener diode is shorted or installed reverse, or IC is shorted.