BUZZER No. 20


Buzzer for general purpose use.

Older version is shown above (Marks 1, 2 & 3), constructed of wood and steel, whilst the later, Mark 4 version, is made of plastic.

Working voltage is 10 - 50v DC.

Fitted with R.F. suppression called a Filter, Suppression No. 12.

Buzzer No. 20A - Consists of two 1,000 ohm coils that can connected in parallel or series - 50 volts DC.
Buzzer No. 20B - Consists of two 50 ohm coils that can connected in parallel or series - 2-10 volts DC.

Drawing - 62799.

Specification - S594.

 

 


 

 
BACK Home page BT/GPO Telephones Search the Site Glossary of Telecom Terminology Quick Find All Telephone Systems

Last revised: February 08, 2024

FM