High Current Stimulus Isolators, A385

The A385 is an optically isolated current source, which can generate up to 100 mA of unipolar or biphasic constant current pulses or DC. Pulse duration is controlled manually or by an external 5 V command. Output current amplitude is determined by a 3-digit 10-turn potentiometer. Maximum output voltage between the stimulating electrodes is +36 V.

• Constant current to 100 mA
• Unipolar or bipolar stimulation modes
• Built-in non-compliance alarm
• Input is optically isolated
• Standard TTL triggering
• DC test mode
• Powered by six rechargeable lead acid batteries
• 36 V compliance
• Output polarity and output 'on/off' switches

Benefits:
100 mA current capability
Bipolar mode automatically generates alternating positive and negative pulses from TTL input
Test mode simplifies performance verification
Optical isolation enhances safety of the preparation and reduces noise susceptibility
Battery charge status LEDs keep the experimenter informed of battery status
Charger included at discounted price when system is purchases as A385RC

Applications:
Muscle electrophysiology
In vivo/in vitro muscle stimulation
The A385 is an optically isolated current source, which can generate up to 100 mA of unipolar or biphasic constant current pulses or DC. Pulse duration is controlled manually or by an external 5 V command. Output current amplitude is determined by a 3-digit 10-turn potentiometer. Maximum output voltage between the stimulating electrodes is +36 V.

Delivers positive, negative or bipolar currents: For bipolar delivery, the polarity of the output can be toggled to the opposite polarity state with each successive pulse presented to the input. Pulse duration is controlled by an externally applied voltage. The in­put connector is a standard BNC, allowing TTL signals from a data acquisition system to be used.

Excellent accuracy and repeatability: The output amplitude is controlled by a 3-digit, ten-turn dial as a percentage of the range selected: for example, a setting of 45.6 in the 0 to 10 mA range translates to 4.56 mA at the output. Accuracy and repeatability are excellent. Designed for subcutaneous stimulation, maximum output voltage at the stimulating electrodes is 36 volts, reducing the possibility of accidental transcutaneous shocks. A compliance/output alarm sounds when the 36 V limit is reached. Internal circuitry ensures electrodes are shortcircuited during inactive periods ('electrode exhauster' feature). The A385 is not appropriate for transcutaneous stimulation.