The DS4 Bi-Phasic Current Stimulator is designed for life scientists who require a high-performance stimulus isolator capable of delivering a bi-phasic isolated constant current stimulus based on an external command voltage signal. The DS4 is specifically built for animal and in vitro electrophysiological applications where low noise and precision are paramount. This standalone stimulator offers advanced features not typically found in traditional stimulator designs, providing flexible waveform generation with enhanced signal integrity.
Unlike other systems such as the NeuroLog Series NL512 Biphasic Buffer and NL800A Stimulus Isolators, the DS4 offers a compact, versatile solution without the need for a computer-based system, giving researchers more freedom in their experiments. It excels at low-noise output, making it ideal for applications where signal purity is critical.
The DS4 operates as a voltage-to-current amplifier, converting a biphasic voltage waveform into a proportional constant current stimulus. This allows for monophasic and biphasic stimuli that can vary in shape from rectangular pulses to sine waves or even completely arbitrary waveforms. It features two input sockets:
The low-noise output stage is powered by a DC supply for the control circuitry and two battery banks for the optically isolated stimulus voltage. This isolation helps minimize interference and ensures high-fidelity stimulation, even in sensitive applications. Additionally, the frequency response of the DS4 extends up to 50kHz (with -3dB roll-off), supporting rapid waveform changes and ensuring reliable operation at frequencies up to 5kHz.
The DS4 features an innovative inactivity sensor that monitors the command signal voltage. If the signal falls below 0.15% of its full scale (in either positive or negative directions), the output is automatically disabled to conserve battery power and prevent unwanted stimulation. This feature helps reduce battery drain and eliminate leak currents during infrequent stimulations while maintaining minimal waveform distortion for repetitive waveforms. The inactivity sensor timeout can be adjusted between 200ms, 500ms, 1s, or 2s using accessible jumpers in the battery compartment.
Important Note: This product is for research applications only. Not a medical device as defined in Regulation (EU) 2017/745 (EU MDR), Swiss Medical Devices Ordinance (MedDO, SR 812.213), or FDA 21 CFR Part 860. Not designed or intended to be used for diagnosis, treatment of disease or any other medical purposes.
