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Interest in PCBs for Bruno Putzey's Preamp and Hans Polak's relay volume control

BPPBP Sel. 64step 16step Services
brianco 1 1 1 1 SMT soldering
astromo 1 3 3 0 -
Bennyboyph 1 1 1 1 SMT soldering
cowanaudio 1 0 0 0
Quantensprung 1 1 1 1 SMT soldering
Mituisho 1 0 0 1
shattered_dream 1 1 1 1
Morde 1 0 0 1
maartn 1 0 0 2 SMT soldering
GfromG 1 0 0 0 SMT soldering
pixelpusher 0 0 1 1
av-trouvaille 0 1 2 0
vasillis 0 0 0 2 SMT soldering
Johnny Canuck 0 1 2 0
toastytoy 1 0 1 0
Mike2 1 0 0 1 SMT soldering
AlphaC 1 1 1 0
ergo 0 0 1 1
sebbyp 1 1 1 1
Total 14 11 16 14
 
Member
Joined 2009
Paid Member
Boards arrived

Boards arrived today as expected - see photos.
Bare boards can be shipped right now, so I will be sending you PMs with payment instructions later today.
I am still waiting for the SMT parts, so the soldered boards have to wait a few days more.
 

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Member
Joined 2009
Paid Member
Update

All bare boards that have been paid for has been shipped:
Code:
Name		BPPBP	Sel.	64step	16step	Services	Status
brianco		1	1	1	1	SMT soldering
astromo 	1	3	3	0	-		Shipped
Bennyboyph  	1	1	1	1	SMT soldering
cowanaudio	1	0	0	0			Shipped
Quantensprung	1	1	1	1	SMT soldering
Mituisho	1	0	0	1			Shipped
shattered_dream 1	1	1	1	
Morde		1	0	0	1			Shipped
maartn		1	0	0	2	SMT soldering
GfromG		1	0	0	0	SMT soldering
pixelpusher 	0	0	1	1			Shipped
av-trouvaille  	0	1	2	0			Shipped
vasillis 	0	0	0	2	SMT soldering
Johnny Canuck	0	1	2	0			Shipped
toastytoy	1	0	1	0
Mike2		1	0	0	1	SMT soldering
AlphaC		1	1	1	0			Shipped
ergo		0	0	1	1			Shipped
sebbyp		1	1	1	1		
Total		14	11	16	14
Boards with SMT parts soldered are now also available - see photos. I will be sending PMs with payment instructions today.
 

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Member
Joined 2009
Paid Member
Status update

All orders paid for have been shipped:
Code:
Name		BPPBP	Sel.	64step	16step	Services	Status
brianco		1	1	1	1	SMT soldering	Shipped
astromo 	1	3	3	0	-		Shipped
Bennyboyph  	1	1	1	1	SMT soldering	Shipped
cowanaudio	1	0	0	0			Shipped
Quantensprung	1	1	1	1	SMT soldering
Mituisho	1	0	0	1			Delivered
shattered_dream 1	1	1	1			Shipped
Morde		1	0	0	1			Shipped
maartn		1	0	0	2	SMT soldering	Shipped
GfromG		1	0	0	0	SMT soldering	Shipped
pixelpusher 	0	0	1	1			Delivered
av-trouvaille  	0	1	2	0			Shipped
vasillis 	0	0	0	2	SMT soldering
Johnny Canuck	0	1	2	0			Shipped
toastytoy	1	0	1	0
Mike2		1	0	0	1	SMT soldering	Shipped
AlphaC		1	1	1	0			Shipped
ergo		0	0	1	1			Shipped
sebbyp		1	1	1	1			Shipped
grayblob	1	1	1	1
Total		15	12	17	15
PayPal sent emails with tracking numbers for all shipped orders; let me know if you have not received one.
 
Last edited:
Member
Joined 2009
Paid Member
The 16-step volume control requires IM06TS relays
You can use instead relays with the same footprint from other manufacturers, such as Omron G6K-2P-Y or Panasonic AGQ20T. Part numbers should be:
IM06TS - G6K-2P-Y-DC12 - AGQ20T12 (for 16-step 12V)
IM07TS - G6K-2P-Y-DC24 - AGQ20T24 (for 16-step 24V)

If substituting relays for the 64-step board, keep in mind that PCF8574AT has limiting current value of 25mA per relay and 100mA in total. It drives six relays, so the rated coil current per relay should not exceed 100/6 = 16mA, and therefore the coil resistance must be upwards of 300ohm. IM23TS with its "ultra high sensitive" coil works, but G6K-2P-Y or AGQ20T would have the potential to exceed the PCF8574AT's specifications.