Electronics-Lab.com Community

voltage control

Recommended Posts

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?

Share on other sites

Here is a circuit that may work for you.  I have a 10k thermistor and a MJE3055. I could try it on a breadboard if you like; converting it to 12v.

Edited by HarryA
update
Share on other sites

Hi, have you tested it by yourself?

Share on other sites

• 2 weeks later...
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

Share on other sites

• 2 months later...

It is always good to make a design and use simulation software. Like proteus. This will give you an idea of how your circuit will behave in real life. Then you can proceed to the hardware implementation.

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

×   Pasted as rich text.   Paste as plain text instead

Only 75 emoji are allowed.