DPDT with SPST. tb-ing in a boss pedal (personal education)

[no one ever]

Using knowledged gained from the 4011-based schematic here and some from this electronic bypass topic, I'm planning on making my own layout to enable dpdt switching with the spst mounted in a boss ds-1... but:

The traces going to the relay connect to set and reset, right? I assume it doesn't matter which goes where?

I'm wondering what R.G.'s improvements would be to this particular circuit (sorry, layouts I can do, but I'm only 15, no EE degree here)

Does the indented dot on an IC denote pin 1, and each pin along that side is 2,3, etc, and the other side starts opposite the dot with (on a dip-14) 8,9,10, etc?

How can I limit the current to 100ma? Or will I have to worry about this.

and one question for personal education... why is a 2n2222 specified, and how can I look for a suitable substitution.

[no one ever]

and what kind of relay should I use... in terms of coil current, high/low sensitivity, coil resistance... i'm thinking of either (mouser part no.'s) 653-g6ak-234p-dc5 or 653-g6ak-274p-dc5 (which seem to be exactly the same)

[CS Jones]

There's no real "set/reset" thing on the 4011. They're just gates and you tell them what to do each time. 2 legs in, one leg out. You combine them in different ways and then you throw a high/low voltage at them and they do your thing for you. You steer them how you want them based on whatever the high/low table says. They move as fast as you tell them to. Nothing gets stored. These in this circuit are set up as inverters. Looks like a buffer into an inverter. The transistor's there to pump up the current to the relay because the chip can't do it alone. Any general NPN should do. Rat shack 2N3904s etc. The diode is there, across the relay, to steer the voltage which builds up as the relay shuts off. As the magnetic field collapses the current wants to fight on and you get spike backs. It protects the rest of the circuit. Hook it up just like he shows and it'll work fine.

Yeah, looking at it from the top with the legs down; start at the indent going down the left side from 1 to 7, cross over on the bottom and count up from 8 to 14 i.e. just like a dual opamp but just with more legs.

You might want to be a little concerned with the current limit but probably not too much. It depends on your supply voltage and the relay's coil resistance. I've got one here which runs on a 15v supply with a coil resistance of around 300 ohm. So that's 50mA. Do you plan on using a wall wart power supply? Yeah, keep your eye on it. This one here works a non latching spdt. I'm sorry, I don't know the part #.

I think you'll like that Laurier circuit. It sounds like just what you want for your DS-1. Good luck.

[cd]

Do a search using these terms:

true bypass boss pedal 56k warning

[no one ever]

Yeah, cd, I've read that topic, but that's implementing a relay based on the DS-1's already existing flip-flop circuit... I'm building a ds-1 off tonepad's layout to replace the smoldering insides of a pristine real-live ds-1 case. just trying to get a switching solution that will work with a basic i/o circuit.

so viewing the chip oriented vertically, from left to right the pins are

1-14
2-13
3-12
4-11

and so on? (sorry, but i'd hate to mess up my first pcb layout)

With a battery, do I have to worry about mA?

only relay with >100mA (using coil ohms / coil vdc) is a 12volter... i wouldn't like going through the trouble of making a 12v psu.



nevermind about the set/reset, not applicable to the relays i have in mind.

[no one ever]

on the schematic, pins 10, 12, and 13, and also pins 11, 5, and 6, are they connected within the chip or are traces required?