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15th February 2008, 08:56 AM
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 Telephone schematics.. Hi i am doing DTMF project, i hav few old working Telephone sets.. i know it has both dtmf encoder & decoder.. without telephone lines i need to generate dtmf tones by giving external supplies , how its possible Thanks | |
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15th February 2008, 09:19 AM
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| Look into the DTMF generator IC inside your tel & give supply according to the datasheet. | |
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15th February 2008, 10:33 AM
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after the 1K resistor place a 10uF capacitor to the other limb of supply. this I forgot before posting the schematic
__________________ Regards, Sarma. Last edited by mvs sarma; 7th July 2008 at 01:14 PM. | ||
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15th February 2008, 10:51 AM
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| Oops I have misread OPs thread I thought He's going to power up the built in DTMF generator seperately.  | |
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15th February 2008, 11:17 AM
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| Thanks this is what i needed.. il try this. | |
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