A Switching Scheme  [documentation]

Original effects with schematics, layouts and instructions, freely contributed by members or found in publications. Cannot be used for commercial purposes without the consent of the owners of the copyright.
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moosapotamus
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Post by moosapotamus »

I made PCB/perf layouts for both versions...

Latching SPDT Footswitch
Image
Image

Momentary SPDT Footswitch
Image
Image

I tried to make them as small and compact as possible while still having a single-sided layout for easy DIY etching. The component numbering follows the schematic that mmolteratx posted here...
viewtopic.php?f=13&t=13295&start=120#p215994

Here it is, for those that do not have Eagle...
Image

Footprint for the relay in both layouts is setup to ground the circuit input (SND) when bypassed. The momentary switch version is verified by me. The latching switch version should be good too, since it was just copied/pasted.

Thanks, mictester!

~ Charlie
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Duckman
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Post by Duckman »

Thanks, looks great and neat.
How about those 40106 unused pins? :hmmm:
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Cub
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Post by Cub »

Splendid ! Thank you. :applause:
If somebody will be etching and drilling a batch of the latching boards, I'd be very happy to buy a bunch.
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gian80
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Post by gian80 »

Hi,

I can't find the Takamisawa relay and considering it's xmas time I should wait a lot ordering them from Taywan.


I found Banzai effect having Panasonic TQ2-L-5 relay, they cost the double I know, but I need one and usually it takes 7 days to get the package. I checked and it's a singol coil bistable latching relay, if I'm not wrong it's exactly Mictester Specs.


Thank u all
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Post by abakuzam »

hi, can we make relay true bypass with bistable 2coil latching relays? with momentary seitch of course, i think all i have to do is cut the power on and off with momentary?
i found a schematic : http://www.electroschematics.com/6546/l ... ent-relay/ and the relay im thinking to use is : Nais TQ2-L2-5V http://pdf1.alldatasheet.com/datasheet- ... -L-5V.html

Thanks.
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electrosonic
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Post by electrosonic »

The schematic you link to is almost identical to mictester's schematic and requires a single coil bistable relay and a SPST switch (not momentary).

There are variations using a momentary switch earlier on in this thread.

Andrew.
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Post by abakuzam »

electrosonic wrote:The schematic you link to is almost identical to mictester's schematic and requires a single coil bistable relay and a SPST switch (not momentary).

There are variations using a momentary switch earlier on in this thread.

Andrew.
i looked at them, but i dont want to use nothing but momentary switch and relay? is that posible? and i found this: http://www.paulinthelab.com/2013/04/sof ... h-for.html

Thanks, sorry for my noob questions and my english.
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electrosonic
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Post by electrosonic »

Have you read the whole thread? This is from the 3rd or 4th page...

https://www.freestompboxes.org/download/ ... &mode=view

Andrew.
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Post by abakuzam »

electrosonic wrote:Have you read the whole thread? This is from the 3rd or 4th page...

https://www.freestompboxes.org/download/ ... &mode=view

Andrew.
i saw that of course i read whole thread, but i dont want to use 4016 etc. i just want to know this type of bypass can be make with momentary switch and the relay only, not other chips like 4016,555,programmables etc.

Kemal.
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electrosonic
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Post by electrosonic »

I guess the short answer is no. (But I would be like to be proved wrong)

The simplest scheme for a latching relay I have come across is something like this -

Image

(Not my image btw)

This is using a SPDT (non momentary) switch.

Andrew.
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Post by abakuzam »

electrosonic wrote:I guess the short answer is no. (But I would be like to be proved wrong)

The simplest scheme for a latching relay I have come across is something like this -

[ Image ]

(Not my image btw)

This is using a SPDT (non momentary) switch.

Andrew.

Thanks.
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Pruttelherrie
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Post by Pruttelherrie »

electrosonic wrote:[ Image ]

(Not my image btw)
What's the 10~22uF for? It can probably be omitted if there's already enough buffering in the rest of the circuit?
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Post by electrosonic »

I thought the same thing, probably not necessary

Andrew.
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Post by coldcraft »

I have built the original circuit with TQ2-L-5V relays by panasonic and can verify that it works with those as well. I can also verify that using an NPN BJT as a switch to ground to make/break the connection works as well.

One comment, if the power line has a filter cap, the circuit does not reset to bypass on power loss. I do not know if the bistable arrangements fixes this, but I have found if the 9V connection to the relay circuit comes before the series polarity protection then the problem is solved. I don't yet know if the relay circuit can be damaged by reverse polarity power.
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Cub
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Post by Cub »

I tried to convert the stripboard layout from page 2 to an IC Protoboard.
So far, I couldn't find a mistake myself, but that doesn't mean there aren't any.
Could you more experienced lads have a look at the attached gif ? :thumbsup

I would have posted the .diy file as well, but:
"The upload was rejected because the uploaded file was identified as a possible attack vector." :shock:
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Relay-board.gif
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brejna
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Post by brejna »

moosapotamus wrote:I made PCB/perf layouts for both versions...

Latching SPDT Footswitch
[ Image ]
[ Image ]

Momentary SPDT Footswitch
[ Image ]
[ Image ]

I tried to make them as small and compact as possible while still having a single-sided layout for easy DIY etching. The component numbering follows the schematic that mmolteratx posted here...
viewtopic.php?f=13&t=13295&start=120#p215994

Here it is, for those that do not have Eagle...
[ Image ]



Footprint for the relay in both layouts is setup to ground the circuit input (SND) when bypassed. The momentary switch version is verified by me. The latching switch version should be good too, since it was just copied/pasted.

Thanks, mictester!

~ Charlie
Is this going to work with TAKAMISAWA RY5W-K 5V? If I make adjustments to for relay lead spacing.
Brane
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Post by brejna »

it works, I don't know if there is any popping but it is working. There are pulldown resistors on the layout if there is any popping.
Attachments
Takamisawa_PNP.png
Switch_Takamisawa_layout.png
Switch_Takamisawa.png
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Post by Mrdorbe »

hey guys, I tried to build the relay true baypass layout for momentary switch, and funny thing happened, it worked with a certien power suplly but not with any other,,, i tried it with 5 diferent regulated power suplies and only the led worked, the relay wouldnt switch but with one specific dc power suplly it did...

i dont undrstand why.. :?:

i build the vertion with the momentary switch and installed it in a boss pedal.
I used all the parts specified in the layout, no replacements.
The regulated power supply that worked is 600mA
And the others I tried are between 300mA-1200mA.
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Post by JFace »

Is there any advantage of using a 14 pin logic chip (40106, 4093) over using a 555 timer? It seems as though having a smaller footprint would be ideal if the functionality is the same.
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Post by mmolteratx »

Mrdorbe wrote:hey guys, I tried to build the relay true baypass layout for momentary switch, and funny thing happened, it worked with a certien power suplly but not with any other,,, i tried it with 5 diferent regulated power suplies and only the led worked, the relay wouldnt switch but with one specific dc power suplly it did...

i dont undrstand why.. :?:

i build the vertion with the momentary switch and installed it in a boss pedal.
I used all the parts specified in the layout, no replacements.
The regulated power supply that worked is 600mA
And the others I tried are between 300mA-1200mA.
Measure the voltage at the power pin of the inverter.
JFace wrote:Is there any advantage of using a 14 pin logic chip (40106, 4093) over using a 555 timer? It seems as though having a smaller footprint would be ideal if the functionality is the same.
Power draw is lower with an inverter.
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