Electronics > Beginners

Help understanding a circuit.

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AVGresponding:
Well, the components in the pics you uploaded are definitely going to be to filter out interference.
The DC resistance of those inductors will be very small, you'll not even be able to get a meaningful measurement with an ordinary multimeter.

I see no reason why DC motors won't work here. By 'pulsed DC' it almost certainly means half or full wave rectification but without any smoothing, so no bulk capacitance.
Speed control is likely by a wirewound rheostat in the handheld controllers.
If the motor you want to use doesn't work, it may simply be inappropriately rated for the voltage or current the 'black box' delivers.

I can't imagine a toy from this era having anything as sophisticated as PWM.

Zero999:

--- Quote from: carlosinseattle on September 26, 2019, 04:08:59 pm ---
--- Quote from: Zero999 on September 25, 2019, 09:34:44 am ---Are you sure the bluish green components are not inductors, rather than resistors? Compare the value read using a multemeter, with the one obtained by reading the colour code.

--- End quote ---

I am not sure at all whether it's a resistor or inductor.  I don't know how to test for the difference, but I'll read up on it and try to test this evening. Here's a closer picture if that helps.

--- End quote ---
The colour bands are blue (6), red (2) and gold (×0.1), silver (10% tolerance) which would give 62×0.1 Ω = 6.2Ω 10% tolerance, if it's a resistor, so is the value you'd get by measuring it with a multimeter set to resistance mode.
https://www.digikey.co.uk/en/resources/conversion-calculators/conversion-calculator-resistor-color-code-4-band

If it's an inductor, then the value measured by the meter will be significantly different, probably much less in this case. As mentioned above, it's most likely a 6.2µH inductor.

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