High Voltage / Piezo Amplifier

A-301 High Voltage Amplifier / Piezo Driver:

The A-301 Piezo Driver / Piezo Amplifier is a High Voltage, High Speed Bi-polar Piezo Driver / Linear Amplifier for applications where low cost amplifier is needed.

It was designed as a Linear Amplifier / Driver for PIEZO Electric Actuators (also known as "Piezo Amplifier"), stacks, piezo sheets, bimorph elements and other devices. It may be also used as a general purpose High Voltage Amplifier for Medical applications (for example, as electode driver for Neurology).

The Piezo Driver / Piezo Amplifier is based on a high voltage, MOSFET amplifier which is capable of driving upto ±175V (350V ptp).

The current capacity of the A-301 is 60mA (100mA peak). The current capacity of the A-301 HS is 100mA (150mA peak).

The A-301 bandwidth is 30kHz, while the A-301 HS can go up to 200kHz.

The slew rate of the A-301 is 30V/µSec, compared to 250V/µSec for the A-301 HS.

By connecting 2 amplifiers in series, the output voltage may be doubled to 700Vptp.

The amplifier section is very stable and has a low noise output and a very low electrical noise - Compare Our Specifications!

  1. Features:
  2. Low cost alternative for small experiments
  3. Very Low Electrical Noise
  4. Low Distortion
  5. High Slew rate-up to 300 Volt/microsecond
  6. Input protection-High Voltage, On/Off
  7. Output protection - Short-circuit, Power loss, Impedance
  1. Specifications:

Amplifier Section:

Maximum Input Voltage


Maximum Output Voltage

±175V (350Vptp)
±200V Optional for A-301 HS

Maximum Current

±60mA for A-301
±100mA for A-301 HS


Into 10K resistive load
A-301: DC 30kHz
A-301 HS: DC 400kHz

Output Power

16 Watt Maximum

DC Gain



Input & Output: Direct DC Coupling

DC Offset

Adjustable to ±8 Volts +On/Off Switch

Input Impedance


Slew Rate

A-301: 30V/µSec
A-301 HS: 300V/µSec

Output Noise

4mV ptp Max. (0.8mV RMS Max.)
(input shorted, 30kHz. BW)

Variable Gain Option

0 - 10X or 0 - 20X or 0-40X available
Please consult the factory regarding that option


H=90mm W=134mm L=235mm

AC Input

Line Input Voltage

110/120V, 60Hz and 220/230V, 50Hz (Switchable by user)

Line Input Current

0.5A peak

  1. Frequency Response Graph:
    1. A-301:
    2. A-301 HS:
  1. Applications
  2. 2 amplifiers can be connected in series or in parallel in order to double the Output Voltage or Output Current. Series connection (±350V into a floating load = 700V ptp).

Please note that both amplifiers must be floating (i.e. be careful not to ground them via an oscilloscope etc.). It is also possible to double or tripple the output voltage by using a special transformer. Using a transformer is possible only at high frequency (over 10kHz.) and it requires more components to be added for balancing and proper termination of the load Parallel connection is done by adding resistors at the input and at the output. Please consult the factory for parallel connection.

Calulating the estimated current needed to drive your load:

In order to purchase the right amplifier to drive your load, you must calulate the peak current needed.

For Capacitive Load:
          Ipeak(A) = 2 π F C Vpeak (for a Sine Wave)
          Ipeak(A) = 4 F C Vpeak (for a triangular wave)
          Ipeak(A) = C dV / dt (for a square wave or sharp rise time)

          F = Maximum frequency (Hz.)
          C = Capacitance in Farads
          Vpeak = Maximum Voltage you need to drive your Load.
          Π = 3.1415927

For Resistive Load:
          I = Vpeak / R

          Where R is the resistance of your load in ohms

          The Current, Voltage and Frequency must be less or equal to the amplifier's specifications

This amplifier is NOT SUITABLE for driving pure inductive loads (i.e. speakers, solenoides, electromagnets etc.)

You must connect your load with thick wires to minimize inductance (like speaker wires). Coaxial cable is not recommended for cables over 2m (6.5 Ft.) because the capacitance of the cable (15-50 pF/Ft) will load your amplifier at high frequencies.


The active impedance of a capacitive load is given by the equation:
Z=1/(2*π*F*C) where π=3.1415, C in Farads, F in Hz. The user must check that under the peak operation voltage, at maximum frequency, the current will not exceed 200mA (0.2A)


Operating Voltage is ±150V, Maximum Frequency = 10kHz, Load is 10&nF
Z=1/(2*3.1415*10,000*10*10-9)=1592 Ohms
150[V]/1592[Ohm]=94[mA] ===> The amplifier will drive that load at an amplitude of 150V (300V ptp)

  1. A-301 19" Rack Enclosure:
  2. Up to 3 A-301 or A-301HS amplifiers can be installed into a 19" rack enclosure. The amplifiers are floating related to the rack and isolated from each other. The user may install or uninstall the amplifiers from the 19" rack enclosure and use them as stand alone units.

For any sort of clarifications kindly contact: