OMNI VOICE MASTER

I had a question for any one even Old Tom, I have an Omni Voice Master Watch it talks (English)every thing was just fine for a year or so and I noticed the battery was going low and so I changed the battery's and then the voice part all of the sudden became very low,I can barely hear it.Is there any suggestions? Thanks..
Original Post
Is it the model with the two slide switches below the display and the push to speak button to the left or one of the later ones with no slide switches?

Did you check the batteries (4*393) before you fitted them? This watch is quite odd inside and uses a discrete component filter/amplifier to drive the smallest permanent magnet speaker you ever did see. As a consequence it pulls a lot of current out of the cells and just one slightly dud one will make it very quiet.

If that is not the problem then probably best to leave it alone- they are really fiddly to dismantle, you have to unsolder wires to get the circuit board out- I know, I did it with one of mine! I bought one of these, new, back in about 1980 when they came out (branded as Trafalgar in UK) and had to send it back for replacement twice before the guarantee ran out! When I took mine apart I could see that the chip was still outputting speech OK on an oscilloscope but the amplifier wasn't amplifying, so much poking and circuit tracing ensured.
TEST the batteries- even fresh batteries have the odd dud one mixed in. And use good branded cells, not Chinese Cheapies off Ebay (branded cells usually have a best before date on). Test the 393s on a 50mA load setting- they need to be able to supply at least this much current to drive this watch
quote:
Originally posted by atyourownwrist:
It is the model with the two slide switches below the display and the push to speak button to the left.I will try fresh batteries and I will keep you posted.I really miss this watch.


Is it possible that you attach a picture ? Quite difficult for us to follow the thread especially those of us seeing this watch for the first time and getting interested in it.
Old Tom posted:
Is it the model with the two slide switches below the display and the push to speak button to the left or one of the later ones with no slide switches?

Did you check the batteries (4*393) before you fitted them? This watch is quite odd inside and uses a discrete component filter/amplifier to drive the smallest permanent magnet speaker you ever did see. As a consequence it pulls a lot of current out of the cells and just one slightly dud one will make it very quiet.

If that is not the problem then probably best to leave it alone- they are really fiddly to dismantle, you have to unsolder wires to get the circuit board out- I know, I did it with one of mine! I bought one of these, new, back in about 1980 when they came out (branded as Trafalgar in UK) and had to send it back for replacement twice before the guarantee ran out! When I took mine apart I could see that the chip was still outputting speech OK on an oscilloscope but the amplifier wasn't amplifying, so much poking and circuit tracing ensured.

Hello Old Tom,

I know this is an old post but I happen to have read this post because I have this same Omni Voicemaster watch and I am having the same issue where the voice volume is so low. I followed your instructions by purchasing new non cheapo batteries. It's not the batteries. I am writing to this thread hoping that you see this. Would you be willing to fix my watch for me? I don't know anything about soldering or fixing electronics. I don't know who to ask?

Add Reply

×
×
×
×