# Circuit to Amplify the ticking sound of a clock

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#### romosco

##### New Member
Hello. I repair and make clocks and pocket watches etc, I need a circuit for a small hand held battery powered amplifier, with a sound pick up lead, that will amplify the tick of a clock/pocket watch; I need to be able to hear the tick so that I can set the clock in beat.
I need to be able to clip the sound pickup lead very close to the balance spring, there is very limited space. Professional units have a crocodile clip that acts as the pickup?? Unfortunately these units are very expensive.
Can any one offer any advice? Thank you Roger

#### MikeMl

##### Well-Known Member
You didn't fill in your location, so I don't know if you have a Radio Shack available
Clarity® CE125 Portable Telephone Handset Amplifier - RadioShack.com
It's a small telephone amplifier
Not sure that this would work for the OP. This is designed to take the signal directly from an RJ11 jack (ie across the phone line itself).

The OP needs a tiny microphone followed by an amplifier. The amplifier is no problem; almost any low-voltage CMOS OpAmp would do. The mic is a little trickier; only because of the tiny size requirement.

#### Hero999

##### Banned
Do you just need an accurate 1Hz timebase or are does it neet to be in sync with the watch?

If it's jut an accurate 1Hz signal then you could use a 32768Hz crystal and a divider to get a 1Hz signal which could be fed into a small speaker or headphones.

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