brake before make? RS 317-651

Kjeldsen · 23rd October 2012, 08:09 PM

I have MiniDSP/MiniDIGI/MiniAMP (one of the first versions, before seperate pins for volume)
I have just bought a nice old turntable (Sony TT-2250) and need to switch between analog and digital input. I know I need a brake before make switch.

I have a couple of RS 317-651 switches. Good quality but I don't know if they are brake before make. How do I find out?

FTN7904 RS | DPDT on-on silver contact toggle switch | 317-651 | Welcome to RS Online

mickeymoose · 23rd October 2012, 11:18 PM

Toggle switches, by mechanical design, are break-before make

You should not use them in low-level audio circuitry. Togglers are preassure type contacts, you need a self-cleaning, wiper type contact, as found in a slide switches. E

Kjeldsen · 24th October 2012, 06:35 AM

Why are they not good for low-level? They have been used as switches in a pre-amp for at least 25 years. It was not made by me, but a audio engineer/technician.

23rd October 2012, 08:09 PM	#1
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	brake before make? RS 317-651 I have MiniDSP/MiniDIGI/MiniAMP (one of the first versions, before seperate pins for volume) I have just bought a nice old turntable (Sony TT-2250) and need to switch between analog and digital input. I know I need a brake before make switch. I have a couple of RS 317-651 switches. Good quality but I don't know if they are brake before make. How do I find out? FTN7904 RS \| DPDT on-on silver contact toggle switch \| 317-651 \| Welcome to RS Online

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23rd October 2012, 11:18 PM	#2
mickeymoose diyAudio Member Join Date: Nov 2008	Toggle switches, by mechanical design, are break-before make You should not use them in low-level audio circuitry. Togglers are preassure type contacts, you need a self-cleaning, wiper type contact, as found in a slide switches. E

24th October 2012, 06:35 AM	#3
Kjeldsen diyAudio Member Join Date: Dec 2003 Location: Randers, Denmark	Why are they not good for low-level? They have been used as switches in a pre-amp for at least 25 years. It was not made by me, but a audio engineer/technician.