TOPIC:

HI!... I'm looking for a bunch of Tamiya 3 prong ceramic resistors to finish off a bunch of cars I've been working on. Anyone know where I can find some? I tried Ebay to no avail.

these guys have a few complete

www.ebay.com.au...2a230d159e

Do they have to be the "proper thing", or just something that works?
If you need the proper thing, I take it you're aware there's several different versions, depending on which model & how old?

If it "just has to work", buy in some cheapy generic 0.3 ohm, 7 watt 2-wire ceramic resistors (From say RS, Farnell, Ebay etc).
Then either join them together in series (One after the other), connect your single blue wire to the middle & your 2x purple wires to the ends.
OR position them a'la Willy, Blazer, Quattro etc, side by side. Put 1 of each purple wire on each resistor, put the blue on the other end & extend it to also plug into the free end of the other resistor (Same as a 3-prong, but wired outside instead of inside the ceramic block).

Have a look at my Quattro resto - my quattro's got generic resistors on it

I got some leftovers and might part with 1 or 2

are they for runner or shelver?



btw how can I check if the ceramic things are still ok?


they are available in most german T stores (6

Nice selection of MSCs you have there Waterbok!

To check your "ceramic things" (Resistors) -
Disconnect the wiring first, so you don't get misreadings, then,

With a multimeter on "low resistance (200?)" scale, put the probes on the middle pin & an end pin, then the middle pin & the other end. In both cases you should get 0.3 ohms (Some meters will display 1.3, 2.3 or even 3.3, cos they're adding on their internal resistance). 0.00 is either a short (unlikely) or the meter isn't sensitive enough. If it's only 1x reading that reads 0.00, it's definately a short & the resistor is fubar. I can't say I've ever seen a shorted MSC resistor, but it certainly happens with those in other equipment, so it IS possible.
MORE LIKELY, you'll get a -1 or no reading (Or "infinity") meaning the resistor is open circuit = broken = also fubar (Or "gone home" as they say in Norfolk).

ALTERNATIVELY, if you don't have a "low resistance" scale on your multimeter, you can use any resistance (ohms) scale, or even the "continuity beeb" function if it's got one, but this will only tell you the resistor isn't broken internally (Which is good enough in 90% of cases), it won't tell you if there's an internal short (Which is unlikely anyway).

OR you can use a 7.2v battery pack, a couple of bits of wire & a 12v automotive bulb. Hook the bulb up to the battery so it lights. Pull 1x wire off so the bulb goes out. Now, stick the wire on the middle pin of the resistor, & the unconnected terminal of the bulb on each one of the end terminals in turn - the bulb should light in both cases, but probably a bit dimmer than when it was only connected to the battery.

OR, hook the MSC up to a battery & 540 motor & try each of the 3x forward & 3x reverse settings. You should be able to hear the motor running at 3x different speeds in each direction. This is the resistor working.

The methods can be used on the 3-pin AND the 2x 2-pin setups, they're exactly the same thing, but wired externally (In the case of the 2-pin) rather than internally (3-pin). The wire looped to bothe 2-pin resistors is the same thing as the centre pin on the 3-pin type.

Resistors have no polarity, ie it doesn't matter which pin you put your +ve battery wire or multimeter probe on

Thx, yes got a multimeter, now thats just the thing I needed to keep me occupied for today.

eddrick wrote:

Do they have to be the "proper thing", or just something that works?
If you need the proper thing, I take it you're aware there's several different versions, depending on which model & how old?

If it "just has to work", buy in some cheapy generic 0.3 ohm, 7 watt 2-wire ceramic resistors (From say RS, Farnell, Ebay etc).
Then either join them together in series (One after the other), connect your single blue wire to the middle & your 2x purple wires to the ends.
OR position them a'la Willy, Blazer, Quattro etc, side by side. Put 1 of each purple wire on each resistor, put the blue on the other end & extend it to also plug into the free end of the other resistor (Same as a 3-prong, but wired outside instead of inside the ceramic block).

Have a look at my Quattro resto - my quattro's got generic resistors on it

HI!... Yes must be period correct.

I would just buy them online or from a local electronics shop and use them. I agree with eddrick too. If you don't mind me asking, how did your project go? If you bought normal resistors, are they still working on your cars?

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