How to Build a Selectable Latching Relays Circuit || Part 1 || Intro and Functionality Overview

Описание: The first video in a series focused on constructing a "selectable" latching relays circuit. The circuit provides one with the ability to selectively latch one of three latching relay circuits in any order
(--without using a microcontroller---). It also includes a master reset button.

This series is provided in light of multiple viewer requests.

If you're not familiar with latching relay circuits in general, then it might be helpful to check out my video on "How to Build a Latching Relay Circuit" prior to watching this series.
   • Circuit Assembly Tutorials || How to Build...  

The circuit presented in this series is not the only way to achieve the target functionality, (nor is it perhaps the "best" way ...e.g., using mosfets rather than transistors would likely be an immediate improvement, using a microcontroller would enable one to expand the number of latch-able relay circuits in a much less parts and labor intensive manner, open up opportunities for achieving selectable 'true bypass' circuits, etc.). This just happens to be how I decided to achieve the requested functionality. I often enjoy the challenge of building circuits that don't require microcontroller oversight and tend to think that such is one of the most interesting and enjoyable ways to learn more about electrical circuitry, components, etc. Also, as the number of components and circuit complexity increases, the number of opportunities to learn about and practice various troubleshooting techniques increases (which can be especially valuable to be familiar with when circuits fail to work as hoped or expected).

I am always interested in hearing about how others might go about achieving the same (or something similar). Please feel free to leave any ideas, suggestions, etc., in the comments. I greatly appreciate feedback and the opportunity to learn from others.

*My apologies to those who may have watched the first take (video) on this circuit. After composing and uploading that video I decided to simplify the circuit into its current form. The previous form utilized a 3 to 8 line decoder IC which was in the end unnecessary to achieve the target functionality, --hence this second take.*

Parts List:
(4) Normally Open momentary buttons
(3) Double Pole Double Throw Relays (DS2Y-S-DC5V used in the video, but most any 5 to 6V DPDT relay would work-- the circuit will also work with relays with coils that have higher voltage requirements, e.g., 9V, 12V, etc.)
(6) NPN transistors (e.g., 2N2222, 2N3904, 2N4401, etc.)
(6) PNP transistors (e.g., 2N2907, 2N3906, 2N4403, etc.)
(15) Schottky diodes (1N5817, 1N5818, 1N5819, etc.)
(9) 330 ohm resistors
(6) 1K resistors
(12) 10K resistors
(3) leds
5 to 6V DC power supply (the required power supply will be relative to the voltage requirements of the coils of the DPDT relays one uses.)
hookup wire (20 to 22, etc., gauge
breadboard

I hope this series is helpful. If so, then please consider clicking like and subscribing to my channel.

If there are any questions, please leave them in the comments and I will do my best to help.

Thanks for watching!