Overview:

The Production Intercom PS3 allows you to operate a moderately large intercom system from batteries. Connect two 12V rechargeable batteries (typically those used in a computer Uninterruptable Power Supply or a motorcycle) in series to achieve 24VDC and connect them to the front panel terminals. The three XLR outputs on the back are in series (one circuit).

The PS3 also provides the 200 Ohm termination point for the intercom audio.

The most important feature of the PS3 is the Swiss-made, very fast circuit breaker on the front panel. Without it, a short anywhere in the intercom circuit could allow the entire amperage of the batteries to flow through the intercom circuit, destroying stations and cable in the process, and possibly causing fire. The PS3 will only pass 1 Amp before the breaker cuts the power.

Features:

• Performance: The Production Intercom PS-3 provides the facilities necessary to power your cabled intercom system from batteries. Typically, a pair of 12V batteries are wired in series to provide 24V, then connected to the PS-3. Best because of size, weight, and rechargeability, are motorcycle batteries, but auto or even lantern batteries may be used. Time between recharging will depend upon the number of stations connected, but as an example, a pair of 150 Ampere/Hour batteries would power ten belt packs, with their signal lights constantly On, for over 1000 hours.
• Durability: The ribbed, extruded aluminum case; glass-filled nylon end bezels; internal support system for the PC board; best-quality XLR-type connectors, and; recessed controls, all contribute to the outstanding ability of the PS-3 to withstand rough usage.
• Value: The comparatively low price of the PS-3 is made possible by the minimized assembly cost resulting from simplicity of construction. Simple construction also affords the use of higher quality components, and increases the ease (thus lowering the cost) of servicing.
• Compatibility: The PS-3 is plug-in compatible with Clear-Com® and other popular headset intercom systems.

The front panel contains a pair of binding posts for attachment of the batteries, and a high-quality circuit breaker which acts as the On/Off switch and limits the current which may be drawn by the system from the batteries to a safe 1.0 Amp. Although the binding posts are colored red and black, an internal circuit corrects reverse polarity.

The rear panel contains three 3-pin male XLR-type connectors, wired in parallel, for connecting belt packs or other stations to the system.The PS-3 provides the necessary termination circuit for the audio line, to maintain stability as stations are added or removed from the system.