How to Build a Selectable Latching Relays Circuit || Part 3G || Finale: Control Wires

The seventh and final video in Part 3 of a series focused on constructing a "selectable latching relays circuit".
The remaining control wires are added and the circuit is completed.
Part 3 has been separated into multiple videos so as to keep the duration of each within more manageable limits.
This series is provided in light of multiple viewer requests.
If you haven't already done so, I would encourage one to check out Parts 1, 2, 3A - F of this series.
And if you're not familiar with latching relay circuits in general, then it might be helpful to also check out my video on "How to Build a Latching Relay Circuit" prior to watching this series.
• Circuit Assembly Tutor...
The circuit presented in this series is not the only way to achieve the target functionality, nor is it perhaps the "best" way. Using, e.g., mosfets instead of 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., 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. And 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.
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 for 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, or 1N5819, etc., The lesser voltage needed to make them conduct, the better)
- (9) 330 ohm resistors
- (6) 1K resistors
- (12) 10K resistors
- (3) leds
- 5 to 6V DC power supply (the required power supply is relative to the voltage requirements of the coils of the DPDT relays one uses.)
- hookup wire (20 to 22, etc., gauge)
- a 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.

[@sandotrinistories.7820]

This video reminds me why I enjoyed working in and teaching electronics for so many years. Great job!

[@philomechtutorials]

+Allan Simon Appreciate the comment and feedback. Agreed, working with and teaching electronics is always enjoyable. Thanks for watching!

[@mayhem1560]

Thanks mate, found that very interesting ...

[@philomechtutorials]

Steve Tasso Appreciate the comment and feedback. Thanks for watching!