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SN7490

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SN7490 - - -

Pinout/Connection Diagram

sn7490 Circuit

Output of 65-240 kHz crystal oscillator is divided by 1000 in three SN7490s to give 65-240 Hz tone required for access to amateur FM repeater. Choose crystal to give exactly desired frequency Q1 and Q2 are MPS6513, and Q3 is 2N1613. Supply can be 9 to 15 VDC from transceiver or from 9-V battery.-P. H. Wiese, Rock Solid Subaudible Tone Generator, 73 Magazine, April 1974, p 79-81.

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PDF / Datasheet

SN7490A PDF Download

SN7490A

File Size: 424145 KB
Manufacturer:

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