Mike G-
1Construction
Use your favorite search engine to find the Datasheet.
Page 8 has the application circuits. -
2Step 2
Control a obsolete Holtek HT9290A/B DTMF dialer
Figure out how to reliably control a Holtek HT9290A or HT9290B "One-Key DTMF dialer" with a microcontroller, buspirate, etc.
Discussions
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