UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Using an electronic transformer for a model tram motor?

Tractorfan · 19th Jun 2017, 12:39 pm

Hi,
A good friend has asked me to make a speed controller for the 12 volt DC motor in his model tram which will run on just a few metres of track.
I've found a simple, two transistor speed controller, and am thinking about powering it with an electronic transformer intended for halogen lamps. It is a high frequency AC device, and I'm pondering how to rectify & smooth it with bits from my junk-box. Would I need special diodes for the HF? or would IN4002s be OK at that frequency (maybe around 15Khz?)?
If not, I could use the 'traditional' 12 volt transformer from a scrap halogen desk lamp instead.
Thanks.
Pete.

19th Jun 2017, 12:39 pm	#1
Tractorfan Dekatron Join Date: Mar 2008 Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.) Posts: 3,184	Using an electronic transformer for a model tram motor? Hi, A good friend has asked me to make a speed controller for the 12 volt DC motor in his model tram which will run on just a few metres of track. I've found a simple, two transistor speed controller, and am thinking about powering it with an electronic transformer intended for halogen lamps. It is a high frequency AC device, and I'm pondering how to rectify & smooth it with bits from my junk-box. Would I need special diodes for the HF? or would IN4002s be OK at that frequency (maybe around 15Khz?)? If not, I could use the 'traditional' 12 volt transformer from a scrap halogen desk lamp instead. Thanks. Pete. __________________ "Hello?, Yes, I'm on the train, I might lose the signal soon as we're just going into a tunn..."