Skip to product information
1 of 2

Cygnus Technology, Inc.

Stimulus Isolation Unit (SIU-91A)

Stimulus Isolation Unit (SIU-91A)


Stimulus Isolation Unit (SIU-91A)

The SIU91 is a precision isolated constant current type stimulator which is variable by a +3 to +10 volt external pulse. The power to this unit can be supplied by an external power pack or by an internal rechargeable battery. All timing is controlled by the external gate pulse generator such as the Cygnus Technology PG4000A. The SIU91A utilizes a Cygnus manufactured ultra high isolation DC-to-DC convertor which eliminates the need for expensive battery replacement.


  • Gated constant current source
  • High compliance voltage (>100VDC)
  • Leakage current less than 1 microamp
  • Current set by precision 10 turn dial
  • Up to 10 mA pulsed current output
  • External power supply included
  • Internal rechargeable battery for even lower noise operation
  • 10 microsecond pulse rise time
  • Output short circuited when pulse off
  • DC to DC converter operates at 125Khz
  • Residual noise is outside of the range of most biological signals
Regular price $967.00
Regular price Sale price $967.00
Sale Sold out
Shipping calculated at checkout.


If you have any questions or need further assistance, please don't hesitate to contact our customer service team. We're always happy to help!

Shipping Policy


Order confirmation and invoices are automatically sent once the order has been submitted.

Please check your Spam Folder if you do not see the emails in your inbox. 


Shipment processing time: 
Please allow a 2-3 week processing time while we get your order in from P1. We will ship your order out as soon as we receive it. Orders are not shipped or delivered on weekends or holidays. Estimated shipping times does NOT include order processing times. 


Shipment confirmation & Order tracking:
You will receive a Shipment Confirmation email once your order has shipped containing your tracking number. The tracking number will be active within 24 hours.


View full details