Mess Deck: General Section > Model Boating

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Martin (Admin):
 
Old advert: 
 

 
https://www.modelboatmayhem.co.uk/forum/index.php/topic,67680.msg731710.html#msg731710

roycv:
Hi Davem99, Do you remember the 'Pompey' esc?  a round i/c chip and the o/p was to 4 big power transistors  Wired as an 'H' with the motor across the centre.  I made my one from a rolling tobacco tin with the lid as the heat sink.  Problem was that you lost voltage as each power transistor lost 0.7 volts across the emitter / base junction so 6 volts was reduced to 4.6 volts.
There was another little cct  you could add in which had the base current go through a small resistor and when there was 0.7 volts across the resistor this would turn on a small transistor which had a relay in the collector circuit and this relay had a connection from the battery by-passing the esc direct to the motor and so you got a full 6 volts across the motor and the heat sink cooled down.
Those were the days when building your own was a lot cheaper, not so now!
Roy

warspite:
My first speed controller was a Bob's Board, fitted to my corvette in 1982, I even created a switch for forward and reverse using the same principle using vero board (copper tracks on a plastic substrate used in electronics projects)


Does Davem99 get most of the points as he named most of the parts, to which end I claim the points for the unmentioned terminal block, does the speaker cable count (black with white stripe being used for the motor connection).

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