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Telephone related - list of circuit diagrams
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The circuit converts the loud sounding bell into a soft and pleasing musical tone
author: visits: 209 
Useful circuit if you feel that somebody is tampering with your telephone line
author: visits: 203 
This amplifier will provide fairly good volume for the telephone conversation to be properly heard in a living room
author: visits: 188 
This circuit will allow you to place a phone call on hold and if you wish to have them listen to music while they are on hold
author: visits: 168
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