Communications Options for the Common Man – Part 5, by Tunnel Rabbit
(Continued from Part 4.) The Swedish M37 field telephone is an example of a good middle-of-the-road approach that is relatively lightweight, affordable, adequately durable, and mostly found to be in good operational condition. These are not as sophisticated and suitable for silent operation as either the TA-312 or the TA-1, yet they can be fitted with a 12 VDC grain of wheat sized red LED that pulses when an incoming call is made to the phone or a peizo buzzer that softly chirps and closely duplicates the TA-312 reduced volume ‘ringer’ merely by connect either to the terminals. Disconnect the …