Is there any simple 4 channel Latching Circuit?

[Gainzilla]

Posted to the PCB forum on this site: https://ampgarage.com/forum/viewtopic.php?f=17&t=31438

There is a full Gerber file you can download. Upload it at jlcpcb.com, and for like $20 you can get 5 PCB's made. Buy the parts to populate the board, and for good Karma, maybe offer the remaining boards to other members here for the cost of postage.

I've used this circuit, and it's very simple and easy to use.

Cheers,

Bryce

[dorrisant]

Posted to the PCB forum on this site: https://ampgarage.com/forum/viewtopic.php?f=17&t=31438

There is a full Gerber file you can download. Upload it at jlcpcb.com, and for like $20 you can get 5 PCB's made. Buy the parts to populate the board, and for good Karma, maybe offer the remaining boards to other members here for the cost of postage.

I've used this circuit, and it's very simple and easy to use.

Cheers,

Bryce

Good idea... Do you have a copy of the instructions? That particular link seems dead... https://ampgarage.com/forum/viewtopic.p ... b5#p389251

Maybe Lauri will show up and help out...

[Gainzilla]

Here are a few things that may help. Updated link for the originally posted one: https://sound-au.com/project163.htm

Re: voltage (From Lauri): Maximum recommended supply voltage for 40175 is 15V. V+ can be anything from 5V to 15V

4ch_Switcher.jpg

From my project notes:

• GND - All grounds connect to the same trace
• V+ - All V+ connections are the same trace
• CTRL 1-4 - Connects to Relay coil anode (-)
• V+ and GND nearest the IC are the main connections to power and ground
• D1-4 connect to one side of each momentary switch
• V+ - near each corner, connect to the other side of each momentary switch
• D6-9 - connect to each channel’s LED indicator

BOM

• R1 - 10k
• R2 - 10k
• R3 - 10k
• R4 - 10k
• R5 - 10k
• R6 - *
• R7 - *
• R8 - *
• R9 - *
• C1 - 10n
• C2 - 100n
• D1 - 1N4148
• D2 - 1N4148
• D3 - 1N4148
• D4 - 1N4148
• Q1 - BC547 (or 2N7000, but reverse the orientation. Pinout is opposite)
• Q2 - BC547
• Q3 - BC547
• Q4 - BC547
• U1 - 40175

LED Resistor Values
https://www.allaboutcircuits.com/tools/ ... alculator/

5V (for use with 5V relays)

• Red - 150 Ω
• Green - 145 Ω
• Blue - 70 Ω
• Yellow - 145 Ω
• Orange - 140 Ω
• White - 70 Ω
• UV - 165 Ω

12V (for use with 12V relays)

• Red - 500 Ω
• Green - 495 Ω
• Blue - 420 Ω
• Yellow - 495 Ω
• Orange - 490 Ω
• White - 420 Ω
• UV - 515 Ω

[Gainzilla]

I've got a 3 channel build in the works. I'll try and get some pics.

[dorrisant]

Awesome... Thanks!!