[Diy_efi] Confused! Lost!

[Brian Dessent]

Adam Wade wrote:

> http://www.easttraining.com/images/Waveforms/gm_tbiv_p&h01.jpg

The first spike decays to ~14V as you would expect but the second spike
decays to almost 20V.  You would expect the opposite of P&H (as far as I
know), intially full battery voltage across the coil then reduced
voltage.  

If there were something else connected to the B+ supply that causes it
to momentarily rise to close to 20V, then that would explain the second
spike (as is always the case when you try to rapidly vary the amount of
current in an inductor.)  Note that it eventually decays back to around
14V, so it's only temporary.  How is that supply voltage
regulated/generated?

Brian

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