[simpits-tech] Arduino PWM to Milliamp meter driver?

[Matt Bailey]

A simple regulated power supply for Arduino outputs, how handy! That
looks like a great little circuit, especially for driving varying loads
(like lamps). But couldn't you just use a transistor in this case? The
meter is a very small, fixed load.

Matt

On Sat, 17 Jan 2015 18:25:31 -0800
Ray <raysot at comcast.net> wrote:

> This looks promising...
> 
> http://playground.arduino.cc/Main/RegulatedPositiveVoltageBooster
> 
> 
> 
> On 1/17/15 5:17 PM, Ray wrote:
> 
> 
> 
> These are 12vdc at full deflection D'Arsonval movements. Kinda weird.
> I know the Aurduino can manage 0-5vdc PWM, but not 12, which is why I
> need some sort of interface circuit.
> 
> 
> 
> On 1/17/15 1:55 PM, Matt Bailey wrote:
> That's quite a complex circuit for such a simple task. :)
> 
> Do these gauges have only two inputs? Most of the small GA engine/fuel
> indicators I've seen are D'Arsonval meters, they are designed to
> measure a resistance from something like a simple analog sending
> unit. This means they can be controlled directly with a variable
> voltage (or PWM).
> 
> I doubt you need an op-amp or transistor etc to drive the thing. Quite
> the contrary, the meters I've worked with are very low-current and get
> full deflection at very low voltages. Figure out how much voltage it
> takes for full-scale deflection, then put a resistor in series from
> the Arduino output to cut the Arduino's 5vDC down to whatever the max
> scale voltage is. This way you have all of your 256 steps of
> resolution from the Arduino's PWM channel.
> 
> Matt
> 
> On Sat, 17 Jan 2015 11:40:13 -0800
> Ray <raysot at comcast.net> wrote:
> 
> Got me 2 beautiful analog fuel gauges from BeechCraft. I don't know
> much about how to drive them from an Arduino though and I was hoping
> someone could point me in the right direction.
> 
> There's a few interesting circuits that I found on the Google, and
> I'm particularly interested in this one, although the input side will
> most likely nee a redesign since I'll be sending PWM from Arduino.
> 
> http://www.next.gr/rf/amplifiers/1mhz-meter-driver-amplifier-l13678.html
> 
> Does anyone have anything handy or suggestions?
> 
> Thanks in Advance, and Happy New Year!
> Ray
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-- 
Matt Bailey

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