Innovation Over 50 Years: Focus on the 1970s

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It’s hard to believe it’s been 50 years since we opened our doors – but since then we have aimed to be the global leader of innovative audio solutions.

As we celebrate our 50 years in business, we are highlighting our key innovations per decade in five blog posts, starting with the 1970s.

In 1972, Projects Unlimited founded the Audio Products Division and quickly purchased the first electrical buzzers (GA 100) for telephone test sets from Roschi Electronic AG in Switzerland. More innovation in buzzer and indicators followed during the 1970s:

  • 1973: First PCB mounted Buzzer offered
  • 1975: First low frequency panel mounted Indicator offered
  • 1976: First PCB mounted Piezo Indicator
  • 1978: First externally driven Transducer

We are proud of these early innovations and look forward to sharing more with you.

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