F5 parts from Digikey.
Miguel,
Here is a list of parts I have saved for F5 order from digi-key.
Not sure if this Thermisitor will work well, but here is the part #.
Other comments welcome.. Had trouble finding the Dale/Vishay 2.2k. Most of the other small resistor are dale 1/2 watt, cheaper than 1/4 watt. Easier to hold and see.
2
FQA19N20C (Min quantity is 250, not sure where to get smaller quantities)
MOSFET N-CH 200V 21.8A TO-3P
2
FQA12P20 (same as above)
MOSFET P-CH 200V 12.6A TO-3P
4
495-2161-ND
THERMISTOR NTC 4.7K OHM 5% RAD
8
P100W-3BK-ND
RES 100 OHM 3W 5% METAL OXIDE
4
3296W-502LF-ND
POT 5.0K OHM 3/8" SQ CERM SL MT
2
ZTX550-ND
TRANSISTOR PNP 45V 1000MA TO-92
2
ZTX450
TRANSISTOR NPN 45V 1000MA TO-92
4
P0.47W-3BK-ND
RES .47 OHM 3W 5% METAL FILM
6
CMF1.00KHFCT-ND
RES 1.00K OHM 1% 50PPM 1/2W
4
CMF10.0KHFCT-ND
RES 10.0K OHM 1% 50PPM 1/2W
4
CMF10.0HFCT-ND
RES 10.0 OHM 1% 50PPM 1/2W
4
CMF47.5HFCT-ND
RES 47.5 OHM 1% 50PPM 1/2W
13
4
CMF150QFCT-ND
RES 150 OHM 1% 50PPM 1/4W
8
P2.20KCACT-ND
RES METAL FILM 2.20K OHM 1/4W 1%
4
P6924-ND
CAPACITOR 33000UF 35V ELECT TSUP
8
P1.0W-3BK-ND
RES 1 OHM 3W 5% METAL FILM
2
GBPC2502A-ND
RECT BRIDGE 1-PH 200V 25A GBPC-A
4
BER178-ND
HEATPAD TO-247 .009" SP900
4
317-1214
CURRENT LIMITER INRUSH 10OHM 20%
Miguel,
Here is a list of parts I have saved for F5 order from digi-key.
Not sure if this Thermisitor will work well, but here is the part #.
Other comments welcome.. Had trouble finding the Dale/Vishay 2.2k. Most of the other small resistor are dale 1/2 watt, cheaper than 1/4 watt. Easier to hold and see.
2
FQA19N20C (Min quantity is 250, not sure where to get smaller quantities)
MOSFET N-CH 200V 21.8A TO-3P
2
FQA12P20 (same as above)
MOSFET P-CH 200V 12.6A TO-3P
4
495-2161-ND
THERMISTOR NTC 4.7K OHM 5% RAD
8
P100W-3BK-ND
RES 100 OHM 3W 5% METAL OXIDE
4
3296W-502LF-ND
POT 5.0K OHM 3/8" SQ CERM SL MT
2
ZTX550-ND
TRANSISTOR PNP 45V 1000MA TO-92
2
ZTX450
TRANSISTOR NPN 45V 1000MA TO-92
4
P0.47W-3BK-ND
RES .47 OHM 3W 5% METAL FILM
6
CMF1.00KHFCT-ND
RES 1.00K OHM 1% 50PPM 1/2W
4
CMF10.0KHFCT-ND
RES 10.0K OHM 1% 50PPM 1/2W
4
CMF10.0HFCT-ND
RES 10.0 OHM 1% 50PPM 1/2W
4
CMF47.5HFCT-ND
RES 47.5 OHM 1% 50PPM 1/2W
13
4
CMF150QFCT-ND
RES 150 OHM 1% 50PPM 1/4W
8
P2.20KCACT-ND
RES METAL FILM 2.20K OHM 1/4W 1%
4
P6924-ND
CAPACITOR 33000UF 35V ELECT TSUP
8
P1.0W-3BK-ND
RES 1 OHM 3W 5% METAL FILM
2
GBPC2502A-ND
RECT BRIDGE 1-PH 200V 25A GBPC-A
4
BER178-ND
HEATPAD TO-247 .009" SP900
4
317-1214
CURRENT LIMITER INRUSH 10OHM 20%
GRollins said:
Ordering online from Mouser on any size order is sent without additional cost .DigiKey charges $5 PLUS shipping for orders under $25. Bought the Fairchild mosfets for under $2 apiece . They shipped priority mail which reached AZ in three days. Shipping charge was $6.
See you later DigiKey!!!
jackinnj said:
Typical figure for these is about 8 ma per volt = 8 mS
The 2SK370 is about five times that, so that math doesn't quite
come out right. If you parallel the devices, the DC current through
them causes you to need a lower Drain resistance so as to set up
the right DC value to bias the outputs, and that lowers the effective
gain further.
They will work, just not as well.
I think a modification of the design would be required to use these
parts effectively.
MikeW said:
Actually, I was hoping he would sent me a chassis and PS too, shipped fedex next day. That way I could listen to it before building it.
mike-diy,
I understand that alternative parts and resources for them can be frustrating.
You'll get a hazing for sure asking these types of questions.
I am trying to post a couple of parts resources for others to order from and for the diyGiants to critisize for the better.
My recommendations is to get the heat sinks first.....Can't do anything without them and surplus ones are my recommendation.
The article on the firstwatt.com is there for people who did not by the AudioXpress article. The last schematic has all the parts for the output boards. The power supply in the production amp is a mystery, but likely close to an F4, and recommendations for other regulated supplies are made as well. My other recommendation is to build the Power Supply first, as you dont need heatsinks for that.....unless you have a nice bench supply.
Mouser has Fets, Tech-diy has jfets, mouser and digikey have all kinds of resistors and funky black parts.
Namaste'
Mike
I predict Audioxpress will offer boards
mike_diy
This stage in the process includes several steps:
Print the schematic
Get a high-lighter pen & a clean sheet of paper, your "crib sheet"
begin marking the components through with the high-lighter
as you do, write the name of the component you have just marked on your crib sheet
continue until all the components have been transferred to the crib sheet
group the components into categories: semiconductors, resistors, capacit*~///(Mongo! there are no cap's!)...jeez...etc.
begin the search
Some parts will fall into your lap, others will take more effort...you will experience the entire spectrum of parts sourcing
...and those grouchy people above...hard to believe...another spectrum entirely...they are your friends
mike_diy
This stage in the process includes several steps:
Print the schematic
Get a high-lighter pen & a clean sheet of paper, your "crib sheet"
begin marking the components through with the high-lighter
as you do, write the name of the component you have just marked on your crib sheet
continue until all the components have been transferred to the crib sheet
group the components into categories: semiconductors, resistors, capacit*~///(Mongo! there are no cap's!)...jeez...etc.
begin the search
Some parts will fall into your lap, others will take more effort...you will experience the entire spectrum of parts sourcing
...and those grouchy people above...hard to believe...another spectrum entirely...they are your friends
Guys, what do you think about this board ?
It's meant to be 44 mm x 44 mm in size, and the parts are named after Mr. Pass' schematic and only difference is that I added R71 and R81 (3 x 150R 2W resistors, instead of 2 x 100R 3W as Mr. Pass had drawn - I don't have 3W resistors).
Momentarily I'm in search for 2SJ74/2SJ108 JFETs (beware of Siliconix/Vishay J108 switching JFETs - in local shop they almost sold me those as Toshiba's - they even had the nerve to ask a 4$ per piece).
It's meant to be 44 mm x 44 mm in size, and the parts are named after Mr. Pass' schematic and only difference is that I added R71 and R81 (3 x 150R 2W resistors, instead of 2 x 100R 3W as Mr. Pass had drawn - I don't have 3W resistors).
Momentarily I'm in search for 2SJ74/2SJ108 JFETs (beware of Siliconix/Vishay J108 switching JFETs - in local shop they almost sold me those as Toshiba's - they even had the nerve to ask a 4$ per piece).
