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A Pompey (Portsmouth) speed controller was the first published circuit diagram for building your own ESC, and it worked. It used what looked like a large top hat type transister with about 6 wires coming out. If memory serves.
At the time we had Bob's boards and very expensive commercial esc's. Like a good week's earnings.
I think there were 4 off OC29 power transitors with the circuit components mounted on Vero board. It was before we all got to know Duel in line integrated circuits or 'chips as we now call them.

Rather large losses in the o/p cct. but otherwise they were great.

There were 3 good RC circuits that came out and that was one of them the others were the relay cct that switched out the power transistors to connect the drive motor to the battery direct at full speed.
The other was the battery eliminator circuit that was in an early issue of the Model Cars magazine, an off shoot of Model Maker.
This was a simple power transistor (small black ones) and a Zener diode plus some stabilising ccts. and I also fitted a red LED. I made at least half a dozen of those.

There is no need for the relay circuit now as the voltage drop across FET's is negligible, and the current esc's I use now are 'different' (?) and has over taken my knowledge.

Roy

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Good luck with the operation. Ed. Roy, A Pompey esc? What's one of them? Are they a home build?

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Hi Ed, hope all goes well for you in hospital.

I have just read through the Titan tug thread. I also made a Pompey esc. Mine was buried in a small tobacco tin which also worked as the heat sink. I lent it to a friend for a while and when I asked how it was going on, he said he had sold the boat, did not think you would want it back!

He was old (but younger than I am now!) and he would ask to borrow magazines from my archive I learnt to ask for them back after a week or so, as the first lot I lent him, he through them out with the rubbish and I retrieved them from his dustbin!

In those days I was gainfully employed and went on to assemble a 6 channel Micron Tx and Rx. The Micron receivers were the best you could have, much better than the rather crude Futaba one. This was part of the rare side of 27Mhtz, being FM but I still have 3 or 4 crystal sets.

The Futaba receiver never really worked properly and it was sent off for repair. It did not work when returned, and I phoned the company (no Internet then) and said you have tuned it to 35Mhtz not the 27 Mhtz I put in my letter.

There was a lot of denial and when he had finished I asked if he wanted the 35 Mhtz crystal back that was in the receiver?
It was repaired retuned etc but as I said was not much good.

I think the Futaba brushed alluminium transmitter was the best example of design and pleasure to hold. Fleet copied it very well though.

Roy

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Blimey, this quiz has more repeats than the BBC!

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I wish you a speedy recovery, EdW. When you're well, you can answer today's questions.

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The topic has already been covered but the question was different.

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Probably won’t be trying to answer questions for a while, going into hospital for an operation tomorrow.😬

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What a differcult question. All could have been right

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Duh... Answer is a dead giveaway!

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