- I've been looking round the web for a simple control circiut( is that spelt
right} but all I get is fancy electoric and computor stuff. all I want is a
simple diagram . to make a controler with speed control and forward and
Can Somebody piont me in the right Direction ?
Dead simple, it is much less hassle to buy a controller from Modelex for
about £20. These are excellent, don't have any feedback and work equally
well on Portescaps, Anchoridge aand Mashimas.
I used to build my own, but components became obsolete and their
replacements were not so robust, even at the lower currents of modern
Details : Modelex
23, Ashfield Court
Middleton Hall Road
Birmingham B30 1AF
Models MDXC1 & MDXC2 - one is hand held and the other panel mounting, but I
forget which is which!
If you still want to build your own from simple components, use the circuit
from an article by Peter Warr in the March 1966 Model Railway News and
substitute a 2N3055 transistor for the OC28/OC35 Power Transistor - forget
the cut out and use a 10 watt car bulb to limit the current. On a dead short
the bulb will light up and the current will be limited to less than 1 amp.
If this proves unreliable, you can sustitute the 500 ohm pot with something
a lot larger, say 10k and use a small transistor (BC103?) to feed the 2N3055
as a kind of preamp. Don't forget the heat sink!
I still have my controller that I built in 1966, but it is on its third
transistor - I managed to get a small supply of OC35s a while ago, rescued
from obsolete industrial discrete component circuit boards - no ICs as they
were known then - chips with every thing today!
----- Original Message -----
From: robert.J.fallis <robert.fallis@...>
Sent: Sunday, October 07, 2001 4:41 PM
Subject: [7mmnga] control
> I've been looking round the web for a simple control circiut( is that
> right} but all I get is fancy electoric and computor stuff. all I want
> simple diagram . to make a controler with speed control and forward and
> Can Somebody piont me in the right Direction ?
> bob fallis
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