06-05-2024, 06:43 PM
(This post was last modified: 06-05-2024, 06:45 PM by ppppenguin.)
The circuit specifies a 200mA meter , not 200uA. It's easy to add a shunt to make a 200uA meter into a 200mA meter. I see there's a protection diode so that is survives the inevitable gross overloads.
Mike mentions the need for accurate heater voltage. I would provide terminals where you can easily check it with a DMM. How accurate it will be between the 24V and 30V taps of a transformer is a matter for measurement. If your mains voltage is rather variable your heater voltage will be too.
Mike mentions the need for accurate heater voltage. I would provide terminals where you can easily check it with a DMM. How accurate it will be between the 24V and 30V taps of a transformer is a matter for measurement. If your mains voltage is rather variable your heater voltage will be too.
www.borinsky.co.uk Jeffrey Borinsky www.becg.tv
