Power Supplies


The econoCom power supply, otherwise known as a PS4, is intended to be used in systems which require only one circuit. Up to 10 belt-packs may run on this system without creating hum or overheating the power supply. We recommend no more than two loudspeaker stations or stage manager stations however.
Older belt-packs, particularly those with incandescent (rather than LED) signal lamps should be added with caution as they draw much more current.
The AC adaptor (AD2410) provides up to 1.0A of current at a nominal 24VDC. It is UL® CE and CSA® approved. It has universal input, operating at any voltage from 100 to 240VAC at either 50 or 60 HZ.
The PS4 system interface provides precise voltage regulation, further smoothing of the DC current (AC hum elimination), automatic overload/short-circuit protection, the necessary termination network for the intercom circuit, an LED which indicates that 24VDC is being delivered, and 3 paralleled XLR jacks for connection of headset stations or strings of stations in a party-line configuration.


The PS301 is the ideal combination of analog/linear and digital circuitry. The supply section is linear with a toroidal transformer coupled with linear regulators to virtually eliminate stray-field radiation. The PS301 will play well with other sensitive audio and lighting gear with which it shares rack space.
The performance of the power supply is extensively monitored by a microprocessor which detects heat, voltage and the status of both the input and output. Each of the three circuits is monitored independently and faults are reported to the front panel. A red LED indicates when there is a problem with each circuit by flashing. If the fault requires shutting down the circuit, the LED lights steadily. The circuit resets when the fault is removed without booting the power supply.
The power supply provides power for up to 66 beltpacks connected to the circuits. Power is well regulated at 24 volts DC and will automatically adjust down during periods of line voltage brownout or high loading with speaker stations or other equipment.
Short circuit protection and current limiting prevent component damage in the event of connection error or cable failure.
The PS301 has a quiet built-in fan that turns on automatically when needed to cool the unit.
Each circuit has a characteristic impedance of 200 ohms at audio frequencies, allowing many beltpacks to be connected together without significantly changing the circuit performance.
The circuits may be linked in A+B or A+B+C configurations via a front panel switch. The termination networks are automatically removed and inserted during circuit linking to ensure a constant impedance for all circuits.
The termination networks may also be manually removed by setting a switch on the rear panel, if desired. This may be useful when using an adjunct network, or if interfacing with a larger communications system.
The PS301 has a program input which can be directed to any or all of the three circuits. Each circuit has an LED VU meter to report to the operator the level being sent to that circuit, and a control to regulate it.
The PS301 will operate in either the 120VAC or 240VAC range. Selection and correct fusing are done on the rear panel. The power inlet is IEC and we supply power cords with the correct plug for most of the world’s electrical outlets.

Technical Information


The PS300 is identical to the PS301 except that it does not have program audio facilities and is less expensive.

Technical Information


The 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.

Technical Information