Difference between revisions of "Octopus Tester"
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** 891 - 1 mA switch setting | ** 891 - 1 mA switch setting | ||
** 8910 - 10mA switch setting | ** 8910 - 10mA switch setting | ||
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| + | == Build == | ||
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| + | [[file:P1798-crop-720px.jpg]] | ||
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| + | [[file:P1070804-crop-720px.jpg]] | ||
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| + | == Cutouts on Bud Box CU-1945 == | ||
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| + | [[FILE:OctopusTester_FRONT-BACK.PNG]] | ||
== Videos == | == Videos == | ||
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<video type="youtube">R95f9gGFUGI</video> | <video type="youtube">R95f9gGFUGI</video> | ||
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Revision as of 16:52, 5 September 2021
Contents
Features
- Classic Octopus Tester
- Based on design example (N5BL)
- Scope set to X-Y for voltage-vs-current measurement of part
- Look at scope pattern for device signature
- Out of circuit component tester
- Useful for matching parts like diodes
- In circuit component tester
- Test 2 units and compare signatures on scope
- Use 6.3V "filament" transformer
- 8.91V - Vpeak
- 17.82V - Vpeak-peak
- 1mA, 10mA "scale" switch
- Pot adjustments to set current (accommodate transformer and line voltage variances)
- 2 BNC jacks
- Timebase = XY
- Connect to XY on scope (X=CH1, Y=CH2)
- CH2 gets set to INVERT
- Plus, Minus Banana jacks
- AC powered
- C13 jack with switch
- 1A Fuse
- Build into Bud Box CU-1945
X-Y Patterns
Resistors
- Resistor - slope line
- Slope = resistance value
- 1 mA setting = 8901 ohms, 1:1 slope
- 10 mA setting = 890 ohms, 1:1 slope
Capacitors
- Oval shape
- 0.3uF, 60 Hz, 8841 ohms
- 3uF, 60 Hz, 884 ohms
- 1 uF cap, 1mA selection
- 1 uF cap, 10mA selection
Zener
- 3.9V Zener
- 1 mA switch setting
- 10 mA switch setting
Schematics
- Adjust RV2/RV2 for total resistance (fixed resistor plus pot)
- 891 - 1 mA switch setting
- 8910 - 10mA switch setting
Build
Cutouts on Bud Box CU-1945
Videos
