Ferrocart vibrator used for farm radios designed to run from 32 Volt DC supply. 32 Volt DC supplies were common on farm properties before the advent of mains power. The batteries were frequently charged by a wind generator or a small stationary engine.

Vibrators are used to change DC into AC which is then be stepped up by a transformer to the voltage required by the radio. The AC output is then turned back to DC to operate the radio, which is done either by a thermionic rectifier or a second set of contacts in the vibrator. A vibrator with two sets of contacts is called a synchronous type. The M225 is a synchronous type. A non-synchronous type requires the use of a separate rectifier.

Synchronous vibrators tend to be quite noisy electrically and require more filtering. Both types were somewhat noisy mechanically; they hum.

Ferrocart is a brand used by Electronic Industries.

Physical Description

Metal cylinder with five pin base in a six pin format with pin 3 missing. Base is loose.

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