also you posted some prices in the other thread:
so the price for one complete build would be:
15€ per PCB
30€ for 110 used/recycled china relays
3€ for 100 capacitors
3€ for the diodes
3€ for resistors
4€ for 200 NPN , and 50 PNP transistors
around 7€ for the timing circuit
1€ for 10 NE555
and depending on what you want 5€ for the display LEDs.
Total cost: 71€.
Those are big prices... already gave some examples.
Even the relays can be bought cheaper or almost same price but new, here's an example: https://www.tme.eu/en/details/leg-1a-5/miniature-electromagnetic-relays/rayex-electronics/leg1a-5/
23 euro cents + vat if you get 250 of them. It's either cheaper or about the same price. Downside is they're a big bigger.
Capacitors can cost as low as 1 euro cents (+vat) each if you buy in volume, here's example:
47uF 25v: https://www.tme.eu/en/details/ce-47_25pht-y/105degc-tht-electrolytic-capacitors/aishi/
100uF 16v: https://www.tme.eu/en/details/ce-100_16pht-y/105degc-tht-electrolytic-capacitors/aishi/
and you can probably buy 1000 resistors for 3 euro... and 7 euro for timing circuit? please...
You'll probably also get better circuit board prices if you make a more standardized size.
Or, for example, take advantage of their special offer of 2$ for 100x100mm boards.
You say your board is 282x356mm ... redesign it to 300 x 300 mm ,,, that gets you 9 x 100x100 panels times 5, or 18/5 = <4$ per board. They make 10 100x100 for 5$ ... so that would take your price down to 9x5 /10 = 4.5$ per 300x300 board
Even if you redesign it to 300 x 400, you're still looking at 12 x 100mm squares , or 24$ / 5 = < 5$ per circuit board.
Do a few hours of research and get better prices.
The prices for this complete thing (5 complete clocks) are as follows:
33€ for the PCBs including shipping (JLCPCB)
6,30€ for all the 600 LEDs
1,32 for 400 1KOhm resistors
0,17€ for 50 180Ohm resistors
0,17€ for 50 10Kohm resistors
1,10€ for 100 6,8MOhm resistors (ebay)
0,15€ for 50 330K Ohm resistors
1,50€ for 5 crystals (local)
2,30€ for 20 33pf disc capacitors (local)
1,75€ for 5 CD4060BE (local)
2,25€ for 5 CD4027BE (local)
2,94€ for 300 2N2222 NPN transistors
2,20€ for 250 220µF electrolytic capacitors
162€ for 500 DPDT 5V relays (0,29€ per relay)
6,84€ for 1900 1N4148 Diodes
5€ for 5 Micro USB step up converters
shipping 12€
Total price for all 5 clocks:
240,99 (excluding import tax)
material price per clock: 48,20
All parts ordered from LCSC, except the 6,8Mohm, the local stuff, and the dc-dc converters.
Have a nice day
Daniel