BUZZER No. 20
Trembler bell for general purpose use.
Older version is shown above, constructed of wood and steel, whilst the later version, shown below is made of plastic.
Working voltage is 10 - 50v DC.
Has R.F. suppression.
Buzzer No. 20A - Consists of two 1,000 ohm coils that can connected in
parallel or series.
Last revised: January 15, 2021