Siren LFO Synthesiser


The Siren LFO Kit is an advanced two-stage VCO that lets you generate a wide range of sounds using four control potentiometers. An excellent addition for synth enthusiasts and those needing sound effects!

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Siren LFO Kit

The Siren LFO Kit is a two-stage VCO that combines a tone generator with a low-frequency oscillator. What this means is that not only can this kit generate tones, but the pitch and rate of change of those tones can be controlled via the four potentiometers. The output of this synth can be selected between a triangle and square wave, and the LFO shape can also be changed to either square or triangular. With a push-pull output stage and small 1W 8-ohm speaker, this little kit can provide hours of synthesiser fun while also providing plenty of educational resources.

Instructions / Documentation

Product specifics

  • • Component Count: 42
    • Battery Powered: Yes
    • Operating Voltage: 9V
    • Operating Frequency: N/A
    • Dimensions (PCB): 100mm x 37mm
    • Mounting Holes: Yes – 4 x M4 (92mm x 31mm)
    • Prebuilt: No – Kit form
    • Batteries Not Included

Included in this kit

  • 2 x 14 DIP Sockets
  • 2 x LM324
  • 1 x 1nF Capacitor
  • 3 x 100nF Capacitor
  • 1 x 100uF Capacitor
  • 6 x 1K Resistor
  • 3 x 10K Resistor
  • 8 x 47K resistor
  • 5 x 100K resistor
  • 3 x 2N3904
  • 1 x 2N3906
  • 4 x 100K Linear Potentiometer
  • 2 x Slide Switch
  • 1 x Red Wire
  • 1 x Black Wire
  • 1 x Speaker
  • 1 x PP3 Battery Connector


The Siren LFO Kit is an excellent choice for those looking to create their own instruments, as the four potentiometers allow for full manipulation of the output tone as well as the LFO modulation. This also makes the Siren LFO great for use as a siren for RC emergency vehicles, video game sound effects, and dioramas. Additionally, as the kit teaches about LFOs, VCOs, and audio push-pull amplifiers, this kit is also ideal for those learning about electronics, and the numerous components in this kit make it an excellent weekend soldering project.


Note that product specifics such as output frequency depend on the tolerance of the components. The numbers provided here are an approximation only. Also take note that the estimated delivery is not guaranteed (unless special delivery is chosen) and free delivery has a maximum waiting time of two weeks. Any product that is returned which is built using lead solder is ineligible for a refund.

All parts sold by MitchElectronics are compliant with RoHS and REACH directives which ensure that they can be used in commercial environments as well as complying with environmental laws. Watch the video below to learn more about RoHS compliance and why it may be important for your next DIY project!
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Additional information

Weight 0.015 kg


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