Piezo Element Driver

Quantity Pricing

The following are the unit prices, as you vary the quantity purchased:






All prices are in Canadian dollars. We use the total number purchased (ELM412P + ELM412SM) for the calculation.


The ELM412 is an 8 pin oscillator circuit for driving piezo-electric elements. With the exception of one external resistor, all of the circuitry required to drive a typical piezo ‘bender’ is contained within this chip.

This circuit allows the user to select one of eight possible operating frequencies by way of three logic level inputs. These eight frequencies represent some of the more common resonant frequencies used for piezo elements. If desired, the frequency can be continually varied by the controlling circuit.

The output of the ELM412 uses a bridge configuration to obtain maximum audio drive for a given power supply level. A single input pin is all that is required to gate the output on and off.

Typically the ELM412 is used to relieve a processor of the duty of waveform generation, allowing it to concentrate on other activities, although the circuit can also be used in stand-alone tone generator circuits.


  • Computer controlled tone generation
  • Alarm warning signals
  • Keyboard click generation
  • Logic probe circuits


  • Low power CMOS design
  • Wide supply range – 3.0 to 5.5 volt operation
  • No external timing elements required
  • Generates eight common piezo frequencies
  • Bridged output for greater audio power
  • Modified waveform for reduced harmonics

Connection Diagram

( PDIP or SOIC, top view )
ELM412 connection diagram

Block Diagram

ELM412 block diagram


The ELM412 data sheet (ver B, 24K):

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