Here we go: After timpert suggested to look for the O2 parts in the EU, we found a couple of parts were difficult to source.
RocketScientist then revised the BOM to use only parts available directly from Mouser.
And since everything seems golden now, we can go ahead with a group buy for the O2 parts.
Since nobody else stopped me from doing so, I would like to offer to host this GB.
As I dont have an established reputation in this forum, I would of course be willing to send my personal details, eBay Name or other forum refernces to an established DIYaudio-member or two.
PARTS:
I used RocketScientists O2-BOM as-is without modifications or going for any of the listed alternatives.
This means there are NO 9V batteries, NO wall transformer, NO aluminum enclosure and also NO low-power Op Amps, "Desktop O2"-Parts, or solder/wick included in the kits.
However, all gain resistors are included. These cost between 1€ and 2€ total and it greatly simplifies the bagging/sorting process for me if I don't have to match resistors to Names...
UPGRADES / EXTRAS:
If desired, you can add parts from Mouser to your order of an O2 kit.
That means if you do want to use the low-power OpAmps, build a desktop version of the O2 or anything of the sort, that is possible.
Simply state the number of O2 kits you would like and add the MOUSER part numbers and the desired quantities.
Please don't assume any volume discounts other than those coming from your own parts, also I can not guarantee availability of any extras at the time I place the order with Mouser.
Also, if your parts are large or heavy, the shipping costs from me to you may increase.
PRICE:
Currently, the Mouser order adds up to the following prices:
Quantity: 1 - 41.72€ / kit (incl shipping)
Quantity: 10 - 20.72€ / kit (free shipping)
Quantity: 20 - 19.63€ / kit (free shipping)
Qunatity: 50 - 16.37€ / kit (free shipping)
Quantity: 100 - 15.02€ / kit (free shipping)
As you can see, the sweet spots are 10 and 100 kits. I expect more than 10 orders, but less than 100 (happy to be proven wrong btw).
SHIPPING:
Most countries (EU at least) should be covered by the 3.45€ rate of the Deutsche Post / DHL .
(50 to 500 grams, priority air mail, cushioned envelope possible, shipment of goods is allowed)
Additional insurance is available (2.05€ base rate + 1.55€ per 100€ of value) -> +3.55€ for most small quantities.
Additionally, I will need to buy envelopes and ESD-bags...
My current estimate for these is 1€ per order for envelopes and ESD bags
Long story short: We will probably end up with around 20 to 50 kits.
Everything included, I expect the total price to be 27€ for one kit + 22€ per additional kit.
This is subject to change as Mouser prices may go up or down and I have not yet bought the envelopes or ESD-bags...
PAYMENT:
Payment is possible via PayPal, bank transfer or cash in an envelope if absolutely necessary.
My Questions for you:
1. Do you want to order the enclosures too? That would increase shipping costs from me to you but may end up saving you money.
2. Batteries? With or without? What brand/dealer would you like/recommend?
3. Anything else I may have missed?
Gentlemen, start your engines!
RocketScientist then revised the BOM to use only parts available directly from Mouser.
And since everything seems golden now, we can go ahead with a group buy for the O2 parts.
Since nobody else stopped me from doing so, I would like to offer to host this GB.
As I dont have an established reputation in this forum, I would of course be willing to send my personal details, eBay Name or other forum refernces to an established DIYaudio-member or two.
PARTS:
I used RocketScientists O2-BOM as-is without modifications or going for any of the listed alternatives.
This means there are NO 9V batteries, NO wall transformer, NO aluminum enclosure and also NO low-power Op Amps, "Desktop O2"-Parts, or solder/wick included in the kits.
However, all gain resistors are included. These cost between 1€ and 2€ total and it greatly simplifies the bagging/sorting process for me if I don't have to match resistors to Names...
UPGRADES / EXTRAS:
If desired, you can add parts from Mouser to your order of an O2 kit.
That means if you do want to use the low-power OpAmps, build a desktop version of the O2 or anything of the sort, that is possible.
Simply state the number of O2 kits you would like and add the MOUSER part numbers and the desired quantities.
Please don't assume any volume discounts other than those coming from your own parts, also I can not guarantee availability of any extras at the time I place the order with Mouser.
Also, if your parts are large or heavy, the shipping costs from me to you may increase.
PRICE:
Currently, the Mouser order adds up to the following prices:
Quantity: 1 - 41.72€ / kit (incl shipping)
Quantity: 10 - 20.72€ / kit (free shipping)
Quantity: 20 - 19.63€ / kit (free shipping)
Qunatity: 50 - 16.37€ / kit (free shipping)
Quantity: 100 - 15.02€ / kit (free shipping)
As you can see, the sweet spots are 10 and 100 kits. I expect more than 10 orders, but less than 100 (happy to be proven wrong btw).
SHIPPING:
Most countries (EU at least) should be covered by the 3.45€ rate of the Deutsche Post / DHL .
(50 to 500 grams, priority air mail, cushioned envelope possible, shipment of goods is allowed)
Additional insurance is available (2.05€ base rate + 1.55€ per 100€ of value) -> +3.55€ for most small quantities.
Additionally, I will need to buy envelopes and ESD-bags...
My current estimate for these is 1€ per order for envelopes and ESD bags
Long story short: We will probably end up with around 20 to 50 kits.
Everything included, I expect the total price to be 27€ for one kit + 22€ per additional kit.
This is subject to change as Mouser prices may go up or down and I have not yet bought the envelopes or ESD-bags...
PAYMENT:
Payment is possible via PayPal, bank transfer or cash in an envelope if absolutely necessary.
My Questions for you:
1. Do you want to order the enclosures too? That would increase shipping costs from me to you but may end up saving you money.
2. Batteries? With or without? What brand/dealer would you like/recommend?
3. Anything else I may have missed?
Gentlemen, start your engines!