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Electronics Forum (Circuits, Projects and Microcontrollers)

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Message History

I've read or heard that portable batteries 18V and lower should never be directly charged off a motor vehicle's electrical system. I presume the unstable nature of auto electrical systems could damage any portable battery including explosion. I haven't tested this theory, so is this an unsafe method of cheap battery recharging?

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The attached image is of a motor controller for a 48V Kobalt string trimmer. Does anybody recognize it or have a clue about the manufacturer? The problem I have is that the motor only works for about 3 seconds when I pull the trigger, then shuts off. (The battery is fully charged. ) I don't think I can get to the bottom of things without knowing who made this.

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Saw advertised an inverter for a camper, 12VDC into 120VAC for powering pertaining appliances :


Test if you get the giggles ? Ground/bond it to where or do not ?



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I have a Sony KV-29VL65A, chasis BA-4, and all of a sudden started to show retrace lines with a green color - that eventually turned to cian- , and auto powering off after a few seconds because the screen goes too bright. I understand this is a protection mechanism. G2 is not the issue here, because I tried to lower it to a minimun and the problem persisted.
Measurements:<...

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I didn't mention that an infrequent and unintended feature of my Tek 2235 is I can hide a mouse trap behind it. When I went to check on its model number for another thread, guess what I found. That's right, yuck. My home is not overridden with mice, but I am in the middle of a forest surrounded by croplands. I catch about one a year in the house -- many more in the garage. Unfor...

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