Theres a diagram on my web site , a lot of the preston guys have used this it works well.
For Scalex I have now advised the use of 50 ohm x3 watt cermet pots costing about £4 each available through Farnell components in the UK instead of the heavy duty ones on the diag as the original was designed for use with more powerfull motors .
For Scalex I have now advised the use of 50 ohm x3 watt cermet pots costing about £4 each available through Farnell components in the UK instead of the heavy duty ones on the diag as the original was designed for use with more powerfull motors .