Hi,
Hopefully someone with a lot more experienced than me can help.
My project needs a low temp coefficient DC signal level shifting for a low production cost project (e.g. less than £5).
There is no DC supply present and the input signal is too small to power anything from it. So I am restricted to passive components.
Anyway, a schottky diode with a series PTC thermistor to compensate for the temperature variation of the diode seemed to work well. However, I need a 7 and 28 ohm thermistor and they don't seem to be manufactured less than 100 ohms.
Can anyone suggest a manufacturer who supplies a PTC thermistor down to 7 ohms or a passive alternative.
Thanks in advance,
Rob
Hopefully someone with a lot more experienced than me can help.
My project needs a low temp coefficient DC signal level shifting for a low production cost project (e.g. less than £5).
There is no DC supply present and the input signal is too small to power anything from it. So I am restricted to passive components.
Anyway, a schottky diode with a series PTC thermistor to compensate for the temperature variation of the diode seemed to work well. However, I need a 7 and 28 ohm thermistor and they don't seem to be manufactured less than 100 ohms.
Can anyone suggest a manufacturer who supplies a PTC thermistor down to 7 ohms or a passive alternative.
Thanks in advance,
Rob