By present-day requirements It will be categorised as double-insulated, Even though none which i've observed would pass the trendy tests.
This is certainly followed by a simple low frequency electric power amplifier. Mainly because there is not any need for high voltages, The entire task is simple to build, will involve no hazard of electrical shock and will need no expensive (or tough to get) pieces. The costliest merchandise would be the 16V AC plug-pack electricity supply.
7V to 12.7V. None of the matters a person iota When the motor operates fine and continues to be not more than lukewarm.
There is a smaller complication, in that the Hammond employs the stray AC magnetic industry to function the alarm buzzer, but This could not have an impact on the ultimate result.
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Utilizing your variable AC electricity source (possibly the Variac + transformer or multi-tapped transformer), utilize adequate voltage to have the motor turning. You will likely come across it would require someplace involving 3 and 6 volts.
You should increase a small number of additional to ensure the motor will run although the mains voltage is reduced then regular, so If your motor begins to run reliably at 3V AC, the optimum voltage is a little in excess of 4V (include all around 40% safety margin).
While this used to be widespread, it is illegal beneath most wiring rules because it does very little to stop the direct from being twisted internally. A knot also locations Intense strain on by now aged insulation, and an accidental (or deliberate) tricky pull could quickly cause the wires to chop from the now degenerating plastic creating a brief circuit.
The 3 clock motors that were rewound and calculated display that latest is about 300mA on average.
The motor for this clock is a reasonably critical affair, since it drives both equally some time and strike mechanisms. Enough time component is clearly not a problem, but placing requirements a substantial level of power. For that reason, the motor is reasonably big which is a multi-pole reduced pace variety (see Image beneath). When it may well seem which the coil is nicely insulated from the case, the clearances are really compact as well as the slightest mishap could easily trigger the movement and bezel to become live.
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If some other person who isn't going to respect the feasible Risk will get hold on the product in question, then that is a special subject solely. Many of us who here function with clocks are obtaining on in decades, and I wouldn't want my kids or grand-children being electrocuted immediately after I'm absent. Electric clocks which have been to be used really should be Certainly Secure ... conclusion of Tale.
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With the clock motor operating, evaluate the voltage over the 1 ohm resistor. You'll want to get a studying somewhere concerning 15-25mV for 220-240V 50Hz motors. I can not give an precise determine for 110-120V 60Hz motors mainly because I haven't got access to 60Hz energy, but I might guess that the current need to be around double that of a nominal 230V motor (i.