This V.3 BOM looks good. BC546 can be BC547/548/549/550 also, no problem, give the whole series as alternatives, or just the BC550 since there is one in the positive reg too. We take advantage of the NPN emitter/base breakdown voltage effect used as a 6-9V Zener, and we charge slowly the 47uF up to that point, then it opens the NPN under the relay coil to saturation so it pulls it. Thus any pin compatible NPNs will do.
Also don't call the circuit a symmetric B1, its easy to be mistaken for a balanced circuit (XLR). Its a single ended DC coupled B1 with symmetric shunt regulators.
Thanks for compiling the BOM. I like that this one is becoming more and more of a community effort. I like the spirit.
Yes, 9140/140 are 100V T0-247s, same pin order as the originals, totally compatible.
Nichicon http://it.mouser.com/ProductDetail/...EpiMZZMukHu%2bjC5l7YeDvmDiEepL4ip7S1%2bPHmRQ=
Low impedance Chemicon is a not bad cap also. http://it.mouser.com/ProductDetail/...=sGAEpiMZZMsCnlYck6hSqJDW/qaMCZY/e8WQN9SvOwg=
Yes, you wanna get close to roughly 150R when in parallel for the 6 input one and near 300R for the basic one. I.e. 660R or 330R will work.
How about if I want to use Lightspeed volume as a pot? Shall we need to change some resistor values on the preamp part?
I decided to get two Hypnotize board, can somebody tell me how can I make the payment(PAYPAL?), since I am new here
What is the impedance of the Lightspeed? If it can be made for 22k and has an input, an output and a ground, use whatever you fancy.
AFAIK, the impedance of the lightpseed varies a bit: It depends on the characteristics of the LDRs used in it.
Is there some special reason why exactly 22K is needed Salas? Its just that you can often find nice stepped pots etc in 25K or even 20K. Could we not use one of those?
Those united chemicon caps are out of stock there. I seem to saying that a lot
Anyway, if its low impedance there is a good few choices. i'll do a list and come back later with some options.
Fran
Is there some special reason why exactly 22K is needed Salas? Its just that you can often find nice stepped pots etc in 25K or even 20K. Could we not use one of those?
Those united chemicon caps are out of stock there. I seem to saying that a lot
Anyway, if its low impedance there is a good few choices. i'll do a list and come back later with some options.
Fran
Ok:
low impedance 100uF caps at 7c each:
#647-UPM1E101MED1TA
http://ie.mouser.com/ProductDetail/...EpiMZZMsCnlYck6hSqP6A8yesdLvBcfEUw%2bSD%2bIw=
and 4700uF, a little more expensive:
#647-UPS1V472MHD
http://ie.mouser.com/ProductDetail/...GAEpiMZZMsCnlYck6hSqGr6PUmyziS%2bVPbxcCCn2so=
Fran
low impedance 100uF caps at 7c each:
#647-UPM1E101MED1TA
http://ie.mouser.com/ProductDetail/...EpiMZZMsCnlYck6hSqP6A8yesdLvBcfEUw%2bSD%2bIw=
and 4700uF, a little more expensive:
#647-UPS1V472MHD
http://ie.mouser.com/ProductDetail/...GAEpiMZZMsCnlYck6hSqGr6PUmyziS%2bVPbxcCCn2so=
Fran
For anyone who is interested, I'm also trying to get some option on a 20 or 25k stepped attenuator for this project. It would be another option besides the lightspeed (good) and alps pots (poor IMHO).
I've used some from a seller on ebay in the past and found his to be good quality. Cost is about 20-25USD incl shipping. I've emailed him and asked would he do them in 20 or 25k.
Would people here be interested in such an option?
Fran
I've used some from a seller on ebay in the past and found his to be good quality. Cost is about 20-25USD incl shipping. I've emailed him and asked would he do them in 20 or 25k.
Would people here be interested in such an option?
Fran
Input Selector Switch for Mezmerize Deluxe BOM
It might be a good idea to also include a suitable input selector switch in the Deluxe BOM - some kind of mechanical rotary switch that will do the job properly.
I assume that we will see quite a few Mezmerize incarnations with motorized pots [there appears to be room for the motor] and remote controlled input switching, but it would still be nice to have the basic rotary switch in the BOM.
It might be a good idea to also include a suitable input selector switch in the Deluxe BOM - some kind of mechanical rotary switch that will do the job properly.
I assume that we will see quite a few Mezmerize incarnations with motorized pots [there appears to be room for the motor] and remote controlled input switching, but it would still be nice to have the basic rotary switch in the BOM.
Another suggestion (this is going to drive you mad, you do realise that right?) - make the pin spacing where the selector/rotary encoder standard so that you could fit a piece of a mill-max strip and the wires from the switch can just run straight into it.
see mouser #575-113120
and:
http://www.mill-max.com/images/products/pdf/075.PDF
basically looking at 0.1" spacing
What do you think?
see mouser #575-113120
and:
http://www.mill-max.com/images/products/pdf/075.PDF
basically looking at 0.1" spacing
What do you think?
Oh yeah, the selector switch:
mouser #105-SR2611F-26-38RN
http://www.taiwanalpha.com/english/p_e_145.htm
The reason I would go for the 2 pole is that if you do, you can use the other pole to selectively power one of 6 LEDs to show which position is selected. I've done this one time before and it was really neat. Run 5V to the centre pole of the switch and wire each leg of the LEDs to the outer poles (ie each of the 6 positions). Other leg of LED to gnd add a current limited resistor on the feed. Its simple enough but adds a lovely touch to the finished project. See here:
mouser #105-SR2611F-26-38RN
http://www.taiwanalpha.com/english/p_e_145.htm
The reason I would go for the 2 pole is that if you do, you can use the other pole to selectively power one of 6 LEDs to show which position is selected. I've done this one time before and it was really neat. Run 5V to the centre pole of the switch and wire each leg of the LEDs to the outer poles (ie each of the 6 positions). Other leg of LED to gnd add a current limited resistor on the feed. Its simple enough but adds a lovely touch to the finished project. See here:
An externally hosted image should be here but it was not working when we last tested it.
Lightspeed volume use 100K opticoupler in series and 100K shunt to GND, somebody said that almost equal to 10K pot. Any changes if I prefer to use Lightspeed?
I saw there are 12V*2 & 15V*2 50VA power transformer can be use, in fact, which one is more suitable?
Here's modified V3.1 BOM according to your suggestions/wishes :
a) BC550 and 560 alternatives added.
b) BOM Name : DC Coupled B1 Shunt PSU
c) Recommended Caps list : Nichicon added
d) 1N4001 Qty for Mezmerize : 7 units for Mezmerize
e) Rotary Switch for Mezmerize + Pin header for wiring
Nice to read from you
a) BC550 and 560 alternatives added.
b) BOM Name : DC Coupled B1 Shunt PSU
c) Recommended Caps list : Nichicon added
d) 1N4001 Qty for Mezmerize : 7 units for Mezmerize
e) Rotary Switch for Mezmerize + Pin header for wiring
Nice to read from you
Thanks Salas,
Yeah.. that went on to be a 24V aikido line stage. Has performed very well and only actually removed it from teh system the other night to try the B1 (regular) that I just built. TT was an ariston RD80. Things have moved on since then, I have a Teres now.
******************************
Nice job on the BMO Korben. I'll be putting my mouser project together later tonight!
*********************************
Lightspeed: the actual figure depends on the LDR characteristics - so it varies. To be honest I see it recommended a lot for the B1 so it must be a good option. I had intended to do one on the B1 I just built but haven't ironed out all the bugs in that system yet. Maybe I'll have it sorted in time for the deluxe!! The lightspeed thread or member udailey is who you need to talk to.
Fran
Yeah.. that went on to be a 24V aikido line stage. Has performed very well and only actually removed it from teh system the other night to try the B1 (regular) that I just built. TT was an ariston RD80. Things have moved on since then, I have a Teres now.
******************************
Nice job on the BMO Korben. I'll be putting my mouser project together later tonight!
*********************************
Lightspeed: the actual figure depends on the LDR characteristics - so it varies. To be honest I see it recommended a lot for the B1 so it must be a good option. I had intended to do one on the B1 I just built but haven't ironed out all the bugs in that system yet. Maybe I'll have it sorted in time for the deluxe!! The lightspeed thread or member udailey is who you need to talk to.
Fran
I am one of those using a Lightspeed as the volume control on a B1 - as soon as these new boards become available I will repeat this setup. One small problem might be that the new matched LDRs are setup for a 500K pot - perhaps Udailey can comment.
Alan,
would you give us some more details or even photos of how you set it up?
My set of LDRs need a 500k pot, but thats not anywhere in the signal chain, it just controls the current going to either the series or shunt LDRs (as I understand it). Some LDRs are more sensitive and so need much less current for a given resistance, hence some batches need a 100k pot and others a 500k pot with say a 5V supply.
Fran
would you give us some more details or even photos of how you set it up?
My set of LDRs need a 500k pot, but thats not anywhere in the signal chain, it just controls the current going to either the series or shunt LDRs (as I understand it). Some LDRs are more sensitive and so need much less current for a given resistance, hence some batches need a 100k pot and others a 500k pot with say a 5V supply.
Fran