A-301 High Voltage Amplifier/ Piezo Driver and Modulator2

August 17, 2009 at 12:35 am Leave a comment

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 up to ±175V (350V ptp).
The current capacity of the A-301 is 60 mA (100 mA peak)
The current capacity of the A-301 HS is 100mA (150mA peak).

The A-301 bandwidth is 30 KHz. while the A-301 HS can go up to 200 KHz.
The slew rate of the A-301 is 30V/uSec. compared to 250V/uSec for the A-301HS.

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!

Competitive Price!


1 Low cost alternative for small experiments.

1 Very Low Electrical Noise.

1 Low Distortion

1 High Slew rate-up to 400 Volt/microsecond.

1 Input protection-High Voltage, On/Off.

1 Output protection – Short-circuit, Power loss,Impedance.


A-301 Piezo Amplifier

Amplifier section:
Maximum Input Voltage
± 10 V
Maximum Output Voltage
± 175 V (350Vptp)
Maximum Current
± 60 mA for A-301, +/-100mA for A-301HS


Into 1 K2 resistive load
A-301:DC – 30 kHz, A-301HS-DC-200KHz
Output Power
16 Watt maximum
DC Gain
Input & Output: Direct DC Coupling
DC Offset
Adjustable to ± 8 Volts + On/Off Switch
Input Impedance
10 K2
Slew Rate
A-301: 30V/ µSec, A-301HS:250V/µSec
Output Noise
4 mV PTP max. (0.8 mV RMS max.)
(input shorted, 30 KHz. BW)
Variable Gain Option: 0-10X or 0 – 20X or 0-40X available.
Please consult the factory regarding that option.
Dimensions: H= 90mm W=134mm L=235mm
AC Input
Line Input Voltage
110/120 V, 60 Hz and 220/230 V , 50 Hz
(Switchable by user)
Line Input Current 0.5 A peak

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).

Series Connection

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 10 KHz.) 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.
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 amplifiers 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*Pi*F*C) where Pi=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 10nF.
Z=1/(2*3.1415*10,000*10EE-9) =1592 Ohms.
150[V]/1592[Ohm] =94[mA] ===>The amplifier will drive that load at an amplitude of 150V (300V ptp).

Fast shipping!!!
All amplifiers are available from stock. We ship within 1 working day after your credit card was approved. Shipping is by UPS. It takes up to 3 working days to ship by UPS to any country.

We accept VISA, MaterCard, American Express. Your credit card is charged only after we ship the order.

For more information about our Amplifiers and Signal Conditioner products , please click here.


Entry filed under: Accessories & Tools.

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