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Is this true?

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Looks like a load of nonsense to me.

JimB
 
So he connect transistor and resistor in series with clock. Thats briliant energy saving circuit.
nope
 
Looks like a load of nonsense to me.

JimB
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This circuit uses transistor half-biased, it works but the transistor limits the current and gets hot, nullifying the use of old Li-ion battery, which is another topic how to isolate good cells from bad ones, it's just easier to use good Ni-MH that are usually the same capacity and lasts as long if not even longer._
 
Well, if you ever pulled an old laptop off a shelf, are the batteries still charged like when you put it away?
Rechargeable Lithium batteries generally have a self-discharge rate that is not good for long term power storage.

**broken link removed**
 
Well, if you ever pulled an old laptop off a shelf, are the batteries still charged like when you put it away?
Rechargeable Lithium batteries generally have a self-discharge rate that is not good for long term power storage.

**broken link removed**
Thank u I understood
 
This circuit uses transistor half-biased, it works but the transistor limits the current and gets hot, nullifying the use of old Li-ion battery, which is another topic how to isolate good cells from bad ones, it's just easier to use good Ni-MH that are usually the same capacity and lasts as long if not even longer._
Here is why a transistor is used
 
Yes, but clock will be slowed down. Probably wont work properly.
He only limit current....
Its nonsense
The transistor is an emitter-follower with a 0.65V base-emitter voltage drop and is biased with two identical-value resistors to reduce the 4.2V battery voltage to 2.1V for the base. Then the clock gets 2.1V - 0.65V= 1.45V like a 1.5V ordinary disposable battery. The clock motor is tiny and uses a tiny current.
When the battery charge is run down then it must be recharged or replaced.
 
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