OLD TELEPHONES How to Repair and Rebuild Them by Jeffrey Race
نویسنده
چکیده
* The Black Magic Telephone Ringing Generator: a miniaturized, pcb-mounting switch-mode inverter generating power to ring a telephone bell from a d.c. source (5, 12, 24 or 48 V). Devices in this family are available with both sineand square-wave outputs with a variety of power levels and package sizes to suit every application. Please view the product range and datasheets at .
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