Changes by last author:
Added:
| (Prefer 1.1.27 if it's a missingtooth setup) |
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* VR sensor resistance: measured: ... Ohm
* DC voltage at EC36pin27: 0.95V (?) ** does it look good with R30=18k onboard pullup to +5V ? (sensor resistance > 3k ??) |
| Tried 2 crank triggers (1JZ-GTE and 2JZ-GTE) Both the same. |
| Tried 2 crank triggers (1JZ-GTE and 2JZ-GTE) Both the same. RESISTANCE ? |
| I’m playing the test trigger signal via a soundcard and can prove the signal is getting to pin 3 of the LM1815 chip, but have probed the output side and it registers nothing. |
| I’m playing the test trigger signal via a soundcard and can prove the signal is getting to pin 3 of the LM1815 chip, but have probed the output side and it registers nothing. |
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Input voltage measured at EC36 Pin27 and also a pickup point in the middle of the board that’s directly linked to pin 27 is around 0.95v AC
Input voltage measured at pin 3 (signal input) of the LM1815 is around 0.25v AC |
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Input voltage measured at EC36 Pin27 and also a pickup point in the middle of the board that’s directly linked to pin 27 is around 0.95v AC
Input voltage measured at pin 3 (signal input) of the LM1815 is around 0.25v AC (and what DC bias ? Voltage might not cross 0V. That is AC too low or DC too positive. You can try a 2k7 or similar (1k..10k) pulldown to GND. |
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It is rather unlikely to blow LM1815, signal bias issue is more likely if the signal amplitude is low. The external pulldown can help, or removing R30 (or using a higher value, like 47k). 18k was perfect for all VR we've seen so far. |