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Old 30th Nov 2022, 10:18 am   #2
russell_w_b
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Location: Penrith, Cumbria, UK.
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Default Re: Cap question - GPO Series 300

Quote:
Originally Posted by els1967 View Post
'Issue is I get a lot of sparking when dialing a number so I'm not sure if the spark suppression cap is working properly. Could be the cap but wanted to check I had the wiring done properly first...'
I think your problem is more likely to be your dial off-normal contacts, which should shunt the entire speech network when dialling. The 2uF section is for the bell and won't be necessary if you've modified the instrument to plug and socket, but will be needed if you haven't.

The 0.1uF section is a radio suppression shunt for the carbon mic and prevents the telephone acting as a demodulator in the presence of radio transmitters. You can probably get away without that, too.

According to the paster diagram for a 332, the 2uF section is connected by a blue and an orange/white wire and the 0.1uF section is connected by a slate and an orange wire.
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