Author Topic: Air Flow Meter +5Volt source from 3 AA's?  (Read 1408 times)

Offline schrocketeer

  • ^ Proficient Motobricker
  • Posts: 196
Air Flow Meter +5Volt source from 3 AA's?
« on: September 17, 2025, 10:14:16 AM »
For testing an Air Flow Meter from an '85 or '86, will 3 AA batteries connected in series (4.5-4.8 VDC) be adequate for the 5 Volt reference source for the flap position sensor (understand series of rectangles)?
Understand I can use a hair dryer at a distance to stimulate the thermistor for air temperature.
  • North Alabama
  • 1985 K100RT very original
Ken  
Current: 85 K100RT, 09 DL650, 16 4RT260, 97 XR100, 70 CT70, 06 YFM400
Past Bikes: 86 K100RT, 85 K100RS, 07 SV1000S, 80 KL250, 99 GS1100, 85 K100RT, 86 VFR700, 91 XR250, 95 VLX600, 86 TRX250, 02 GZ250, 83 Z50R, 78 ATC90, 86 XR250, 79 XR500, 72 AT1, 75 YZ360, 78 DT400, 75 DT125, 73 Trail 70

Offline schrocketeer

  • ^ Proficient Motobricker
  • Posts: 196
Re: Air Flow Meter +5Volt source from 3 AA's?
« Reply #1 on: September 17, 2025, 12:37:47 PM »
For other's reference, here's a great dissection of the Air Flow Meter: https://www.k100-forum.com/t11055-bosch-air-flow-meter-restoration-summary
  • North Alabama
  • 1985 K100RT very original
Ken  
Current: 85 K100RT, 09 DL650, 16 4RT260, 97 XR100, 70 CT70, 06 YFM400
Past Bikes: 86 K100RT, 85 K100RS, 07 SV1000S, 80 KL250, 99 GS1100, 85 K100RT, 86 VFR700, 91 XR250, 95 VLX600, 86 TRX250, 02 GZ250, 83 Z50R, 78 ATC90, 86 XR250, 79 XR500, 72 AT1, 75 YZ360, 78 DT400, 75 DT125, 73 Trail 70

Offline Los_gatos

  • Motobrick Curious
  • Posts: 30
Re: Air Flow Meter +5Volt source from 3 AA's?
« Reply #2 on: September 24, 2025, 10:25:53 PM »
You could probably use a 12v to 5v buck converter. That might be easier and they're pretty cheap.
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  • 92 k75, 95 gs500

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