Budget Friendly



  • Two recording channels with stimulus control, differential INPUT(S)
  • One power supply for up to four EXT-02 B amplifiers, one REL-08 B and one AUD-08 B system
  • Two different OUTPUTS:
    • DC with GAIN x10 and OFFSET control, range ± 500 mV
    • AC with GAIN x10 to x10k, HIGHPASS and LOWPASS filtered
  • HIGHPASS filter (AC): 0.1, 1, 10, 30, 100, 300 Hz
  • LOWPASS filter (AC): 500, 1k, 3k, 5k, 10k, 20k Hz
  • NOTCH filter (AC and DC): 50 Hz or 60 Hz, activated by switch
  • MONITORS (telegraphs) for filters and gain
  • External STIMULUS input with 2 mm banana jacks, STIMULUS CONTROL with switch or TTL signal
  • Data bus connection to AUD-08 B and REL-08 B

Available headstages:

  • Standard headstage with one, two or four channels
  • Standard headstage with direct stimulation through the same electrode
  • Miniature headstage with one, two, four, six or eight channels (via breakout box)
  • Miniature headstage with direct stimulation via separate electrode or switchable
  • Tetrode miniature headstage with four channels

Use the AUD-08B for audio monitoring and the REL-08B for the measurement of the electrode resistance


Part No. Description
EXB-EXT-02B EXT-02B Two Channel Low-cost Extracellular Amplifier (master version)
EXB-EXT-02BS EXT-02B Two Channel Low-cost Extracellular Amplifier (slave version)
EXB-HS Standard Headstage for EXT-2B Amplifier
EXB-AUDIS-08B AUD-08B Audio Monitor System for EXT-02B
EXB-RES-08B REL-08B Electrode Resistance Meter for EXT-02B
TMR-01B TMR-01B Low-cost Digital Timer Unit (desktop)
ISO-01B ISO-STIM-01B Low-cost Isolated Stimulator Unit (desktop)
ISO-01B-ACCU Battery Pack
ISO-01B-CHAR Charger for Battery Pack
ISO-01B-PWR Power Supply for ISO-01B

Technical Data

Input (headstage):
>10-12 W, range ±1 V

Differential Input:
CMR >90 dB at 1 kHz (tested with 0 W input resistance)

Input Capacitance:
30 pF

OFFSET compensation:
set by potentiometer, range: ±1 V

single pole, attenuation: -6 dB / octave,
|corner frequencies (Hz): 0.1, 1, 10, 30, 100, 300

single pole, attenuation: -6 dB/octave,
corner frequencies (Hz): 500, 1k, 3k, 5k, 10k, 20k

rotary-switch 10-100-1k-10k

range: ±10 V into 1 kW / ±1 V into 50 W

Power Supply:
18V, AC, min. 1.5 A

305 x 180 x 105 mm³ (W x D x H)


Input (headstage):
>1012 W, range ±1 V

Headstage Size:
70 x 26 x 26 mm3

Holding Bar:
length: 150 mm; diameter: 8 mm


EXT-02B Manual
TMR-01B Manual
AUD-08B Manual
ISO-01B Manual
REL-08B Manual

B-Series Brochure 
TMR/ISO Brochure