I wasn't expecting the circuitry in this unit to be so clever. It's using standard discrete components, but in a very clever way that allows the coil to push and pull while also sensing and synchronising with the pendulum movement.
It's worth buying these movements just for the pendulum kicker module.
Here's a generic eBay search link to the UK site:-
https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=Quartz+Pendulum+Drive+Unit+Module+For+All+Standard+Movements+-+Clock+Making&_sop=15
If you see a listing that you like but want to buy it from the com site, try changing co uk to com in the URL.
Target price is around $2.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
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It's worth buying these movements just for the pendulum kicker module.
Here's a generic eBay search link to the UK site:-
https://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&LH_BIN=1&_nkw=Quartz+Pendulum+Drive+Unit+Module+For+All+Standard+Movements+-+Clock+Making&_sop=15
If you see a listing that you like but want to buy it from the com site, try changing co uk to com in the URL.
Target price is around $2.
If you enjoy these videos you can help support the channel with a dollar for coffee, cookies and random gadgets for disassembly at:-
http://www.bigclive.com/coffee.htm
This also keeps the channel independent of YouTube's advertising algorithms allowing it to be a bit more dangerous and naughty.
I recently got a clock that has no battery but runs on a wound up spring. It has a pendulum that is attached to an escarpment and prevents the clockwork to run down immediately.
2 wires of my oscillator circuit has broken & I wasn't sure where to place the this video really helped me
Yes, the coils sense the pendulum. Also, a problem with the basic stable multivibrator is that if perfectly balanced (unlikely but possible), it won't start. It needs an imbalance either with a resistor or a capacitor to start. Thus the extra capacitor. I never liked those. Too unpredictable. If they stop for any reason, they don't restart. They stay stopped until reset somehow.
I have a similar unit (ten actually. eBay you know.) that only uses one magnet. I use the electrical guts to drive a little clock I made, the pendulum is the actual timekeeper, it's a 1/2 sec pendulum (1 Hz).
The anchor pendulum is skinny the pendulum is a curved blade which I pointed out a few days ago on how the curve blade looks
There’s a subtle difference between this circuit and the standard cross coupled multivibrator. In the standard circuit there is always one transistor fully ON and one transistor OFF. The ON transistor is held in the saturated state by the resistor from the positive supply to its base. The OFF transistor does the timing, its base is negative and is charging up towards the positive rail. When the base voltage reaches +0.7V the circuit flips.
In the modified circuit one transistor is OFF and the other one is not saturated but is held in a linear mode with perhaps a volt or two on its collector. This is because its base is fed by a resistor from its collector. This is negative feedback which keeps the transistor in the linear mode and operating with high gain.
The result of this is that a small voltage induced in the coil on the opposite side by the magnets can easily inject a current into the ON transistor’s base and cause the circuit to flip. This is how the circuit synchronises itself to the pendulum. This also makes it self starting because the magnets normally rest next to the coil and the slightest movement will induce a voltage which can flip the circuit and start it oscillating.
I don’t know what the extra capacitor is for.
I don't know why you didn't scope that circuit to really see what was going on. Never saw an astable with coils for a load like that.
Talk about synchronized oscillators, I bought a generator for adjusting color tvs back in the early 1970s, which used unijunction transistor oscillators, each one working at a sub-multiple of the preceding stage. There were some trimpots you had to fiddle with to get a stable pattern, and it seemed to be somewhat temperature-sensitive.
Organs used bistables for frequency division, having one master oscillator for each note in a top octave and then dividers for all of the lower notes. These were discrete in real early units, chips in later ones;
Hello Clive ,I have a question . Would it be possible to build a pendulum clock with the drive in the lower bit from the pendulum??? So that the pendulum hangs on a string and the driver in the lower part .
Kind regards Philip
Thank you very much for the video is really helpful! This video proves that quartz pendulum moment can be repaired if the pendulum in the clock is not functioning but the clock keeps time normally.
👍👍👍👍👍👍Verynic Professional
I have one in my den and there is no access to the pendulum from the front, so when the clock is on the wall so no way to manually start it, that is probably why they self-start.
ok ok ok