Bottlehead Forum

Bottlehead Kits => Legacy Kit Products => Quickie => Topic started by: mortron on December 16, 2013, 08:31:37 PM

Title: Rotary Switches
Post by: mortron on December 16, 2013, 08:31:37 PM

So I have the older model Quickie and amp re-locating the inputs and would like to add one. My idea is to use a rotary switch to select the inputs and replace the original two position toggle. I see there are ones with 1 Deck and 2 Deck and poles... I am assuming I want 3 position, but beyond that I am a little lost. What exactly do I need to look for? Thanks in advance.

Title: Re: Rotary Switches
Post by: Bonzo on December 16, 2013, 11:02:27 PM

I think 2 poles 3 positions is good, assuming you'll join together all signal grouns as per original Quickie.
I think you'll want a non shorting one also, or a " BREAK BEFORE MAKE "

QUOTE:
Shorting (or make-before-break): the switched terminals are briefly
connected together while the common terminal is moved from one
to the other. Used when you don't want the circuit open at any time,
and you can accept that the terminals get briefly shorted.

Non-shorting (or break-before-make): the common terminal is
briefly left floating while moving from one switched terminal to the
other.

Title: Re: Rotary Switches
Post by: Zimmer64 on December 17, 2013, 12:23:12 AM

These are great in my experience: http://www.goldpt.com/selector.html You will need a 2P-3T-1D.

Michael

Title: Re: Rotary Switches
Post by: Paul Birkeland on December 17, 2013, 07:16:00 AM

Here are some good options:

http://www.digikey.com/product-detail/en/D2C0303N/451-1048-ND/514102 (http://www.digikey.com/product-detail/en/D2C0303N/451-1048-ND/514102) (You can leave the 3rd set of lugs empty)
http://www.digikey.com/product-detail/en/44D30-01-2-AJN/GH4402-ND/98643 (http://www.digikey.com/product-detail/en/44D30-01-2-AJN/GH4402-ND/98643)
http://www.digikey.com/product-detail/en/42D36-01-2-AJN/GH4202-ND/98637 (http://www.digikey.com/product-detail/en/42D36-01-2-AJN/GH4202-ND/98637)
http://www.digikey.com/product-detail/en/C4D0304N-A/451-1014-ND/514068 (http://www.digikey.com/product-detail/en/C4D0304N-A/451-1014-ND/514068)

Some of these have extra positions, but you can move the tabbed washer to adjust the switch to stop at 3 positions. 

Title: Re: Rotary Switches
Post by: Paul Joppa on December 17, 2013, 12:56:25 PM

With a 4-pole, 3-position switch you can switch the grounds as well as the hot signal. This is what we do in the other preamps, because if one source causes some ground current it won't automatically pollute the other sources. But in most cases this is not a problem and you can switch just the hot signal, joining all the grounds.