EMRFD Message Archive 1543

Message Date From Subject
1543 2008-04-03 21:46:54 MILAREPA TWO TONE GENERATOR
Does someone has made two tone generator from emrfd ?
Mine doesn't seem to work, use available 12K resistor instead of 10K. Is
this critical ? I have check the ugly wiring was right.
Please suggest troubleshooting, such as simple voltage or scope measurement.
Thanks before.

1544 2008-04-05 10:58:56 Wes Hayward Re: TWO TONE GENERATOR
Hello Indra, and group,

I assume the generator you describe is that in EMRFD Fig 7.26. It
may have been a major mistake to change the 10K to a 12K. In the
Wienbridge oscillator circuit, the starting gain should be 3 or a
little bit higher. This is set by the ratio of the 10K and 22K
resistors that attach to pin 2 of the two oscillator integrated
circuits. The voltage gain is going to be (1+22K/10K)=3.2, which
is enough for oscillation. If the 10K is changed to 12K, the gain
drops to 2.83 and oscillati
1545 2008-04-06 19:23:35 MILAREPA Re: TWO TONE GENERATOR
Dear Sir,
Thank you, I will try soon.

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1550 2008-04-11 18:46:22 MILAREPA Re: TWO TONE GENERATOR
The 2 tone generator WORKS !, after replace the 12K to 10K.
Thank you.

Indra S.

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