www.circuitstoday.com |
| Posted: 23 Feb 2011 12:01 AM PST Intercom circuit with ringer Description. A simple intercom circuit designed based on transistors is shown here. This intercom circuit does not require a changeover switch and you can use it just like a telephone and a ringer circuit is also included. IC1 UM66 and transistor Q1 forms the ringer section. When pushbutton switch S1 is [...]  |
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