These two are driving-circuits of Old Transistor balanced wheel clocks. As below, there are two type of circuits. Could you please explain me what is the purpose of resister “X” .. why two type of arrangement ? what is the most effective circuit ?

 

In number 1 the resistor biases the transistor directly from the battery supply, so it's quicker to turn on , whereas in number 2 it's connected through the coils, so the back emf will switch it off faster , i would say number 2 is the best circuit.

 

In number 1 the resistor biases the transistor directly from the battery supply, so it's easier to turn on , whereas in number 2 it's connected through the coils, so the back emf will switch it off faster , i would say number 2 is the best circuit.

Thanks for the information:

in both cases, Is the swing of the balanced wheel same ?

 

I am guessing that the choice of circuit might matter depending on the construction of the wheel. One would “kick“ the wheel harder, the other let go more suddenly.

 

I am guessing that the choice of circuit might matter depending on the construction of the wheel. One would “kick“ the wheel harder, the other let go more suddenly.

Thanks!

is it ..

1. let go more suddenly
2. “kick“ the wheel harder?

 

Circuit 1 would turn on faster, circuit 2 would turn off faster. So, the reverse of your numbering.

 

Circuit 1 would turn on faster, circuit 2 would turn off faster. So, the reverse of your numbering.

I see,

so what is the best for a clock ?

 

I see,

so what is the best for a clock ?

I am guessing that the two circuits are illustrated because balance wheels do better with one or the other due to some aspect of their construction. So, if I am right, it would depend on the clock.

 

The RLC oscillator circuit shown is simplistic and unregulated relying on the imagination to be a balanced wheel
for driving a clock that one would assume the mechanical clocks are somehow related.

 

The RLC oscillator circuit shown is simplistic and unregulated relying on the imagination to be a balanced wheel
for driving a clock that one would assume the mechanical clocks are somehow related.

This is correct ! even here, it runs a little fast or a little slow without any interference.

 

Jun Ye explains where his experience with clocks has taken him.

 

I am guessing that the choice of circuit might matter depending on the construction of the wheel. One would “kick“ the wheel harder, the other let go more suddenly.

Does the kick attract the magnet or repel it?
Does which circuit is chosen depend on the answer to the above?

 

Does the kick attract the magnet or repel it?
Does which circuit is chosen depend on the answer to the above?

Does the kick attract the magnet or repel it? --- Don't both are same ???

 

Does the kick attract the magnet or repel it? --- Don't both are same ???

In one case the approach of the magnet towards the coil triggers the circuit and the magnet is attracted towards the coil. Then the coil current must be switched off quickly when the magnet is centred on the coil otherwise the coil will be opposing the magnet motion as it tries to move away from the coil.

In the other case the circuit is triggered quickly just after the magnet is centred on the coil and the coil repels the magnet to propel it on its way. Later the coil current is switched off but exactly when is less important.

In the first case the switch off should be fast but in the second case the switch on should be fast.

 

In one case the approach of the magnet towards the coil triggers the circuit and the magnet is attracted towards the coil. Then the coil current must be switched off quickly when the magnet is centred on the coil otherwise the coil will be opposing the magnet motion as it tries to move away from the coil.

In the other case the circuit is triggered quickly just after the magnet is centred on the coil and the coil repels the magnet to propel it on its way. Later the coil current is switched off but exactly when is less important.

In the first case the switch off should be fast but in the second case the switch on should be fast.

So what is the most important design for a clock ?

 

So what is the most important design for a clock ?

No idea. That's why I asked the question.

 

No idea. That's why I asked the question.

any expert to answer this................???

 

I think the answer is in post #8.

Bob

 

I think the answer is in post #8.

Bob

it's and open ended answer, i suppose. what will stop over swing of the balance wheel ?

 

The spring and the the timing of the pulse. The entire electro-mechanical system must be considered.

Bob