Millett NuHybrid Скачать руководство пользователя страница 26 | Manualshive

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15. Output bias adjustment

Set the DMM to measure DC volts, and position the leads of the DMM on TP1 and TP3 as
shown in the photo below. Adjust R18

, the “L Bias” potentiometer, to get a reading of about

11V.

Move the positive lead to TP2,

and adjust R17 (“R Bias”) to get about 11V again.

If you cannot adjust the pot to get to 11V, unplug power and go back and check everything
again.

Note that you can experiment with this setting to change the sound of the amp. There will be
no harm to the amp in setting this wherever you like.

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Содержание NuHybrid

Страница 1: ...e parts on the BOM may be out of stock The BOM has some suggestions for alternate parts that can be used instead as well as alternate parts that are available from Digi Key Note that the Mouser BOM ma...

Страница 2: ...lower left so you can expect to find resistor R1 somewhere near the lower left corner Some parts like resistors have no polarity and can be installed in either orientation Others like diodes and elec...

Страница 3: ...l resistors Each bag of parts from Mouser looks like this Match the Mouser part number or the description with the parts on the BOM In this case you will see that 33 2k resistors are installed at R12...

Страница 4: ...no particular order install the resistors After you remove them from the bag you ll need to bend the leads you can just use your fingers so they look like this Next insert them into the PCB in the app...

Страница 5: ...And bend the leads on the backside slightly Next solder the leads Touch the soldering iron tip to both the pad and the lead and apply a little solder...

Страница 6: ......

Страница 7: ...Next using wire cutters diagonal cutters trim the excess wire leads It should wind up looking like this Now repeat this process for all of the resistors...

Страница 8: ...When you re done the board should look like this...

Страница 9: ...before soldering Note the diodes have a band on one end that matches with the band on the PCB silkscreen and the PCB also has a dot near that end Be careful as the two 1N4148 diodes D3 and D4 look vi...

Страница 10: ...ets Two IC sockets are installed for the opamps so you can change them to different ones if desired Note the orientation of the sockets there is a small notch to indicate pin 1 which is aligned with t...

Страница 11: ...in as before but since they have short pins that cannot be bent they somehow need to be held in place while you solder the pins If you are dexterous you can hold them with one finger while soldering...

Страница 12: ...e board over and solder the pins as before No trimming is needed It should look like this when you re done By the way don t worry about the flux that gets splattered on the board when soldering It s h...

Страница 13: ...ided might be slightly different sizes or colors than those shown These are small parts with the two lead wires sticking out one side so you don t have to bend the leads before inserting them into the...

Страница 14: ...led the correct way the PCB has a dot marking the positive terminal of the capacitors The longer lead wire is the positive terminal Note that on the capacitor body only the negative side is labeled so...

Страница 15: ...6 Install large electrolytic capacitors Install the four larger electrolytic capacitors the same way as the smaller...

Страница 16: ...Note that Q1 is a 2N7000 MOSFET and Q2 Q3 are 2N3904 NPN transistors they look almost the same but you can read the part number on the device You need to slightly bend the leads of the transistors an...

Страница 17: ...8 Install the test points There are three small test points installed near the opamps Insert them and solder...

Страница 18: ...K1 and common mode inductor L1 Just place them the relay will only go in one way and the inductor works either direction bend the leads a bit solder and trim the excess leads Note that the relay may b...

Страница 19: ...put and some you may need to use tape or your fingers to hold it in place while you solder them in Make sure you have the parts seated all the way down on the PCB before fully soldering them in It s...

Страница 20: ...ap into the PCB but J1 may need to be held in with tape or your fingers when you solder it in As before make sure the parts are fully seated on the PCB before completely soldering them in 12 Install t...

Страница 21: ...part First peel the backing off of the two squares of double stick foam tape these are supplied with the PCB and Nutube and apply them to the PCB in the area indicated on the silkscreen The foam tape...

Страница 22: ...king from the top of the tape to expose the adhesive CAREFULLY insert the Nutube into the PCB and press it onto the tape The pins are very soft and fragile so go slow and be careful not to bend the pi...

Страница 23: ...nspection Before you plug the opamps into their sockets first do a thorough visual inspection of the PCB Make sure all the parts are soldered in and all are oriented correctly Match it to the photo be...

Страница 24: ...parallel to fit the socket Then press them into the sockets Make sure you align pin 1 with the notch on the sockets and the notch on the PCB silkscreen Be careful that the leads don t get bent If the...

Страница 25: ...onnect it to the power jack on the board and plug it in Flip the power switch on on is up The power LED should light and you should see a bluish white glow from the Nutube triodes if not unplug the po...

Страница 26: ...otentiometer to get a reading of about 11V Move the positive lead to TP2 and adjust R17 R Bias to get about 11V again If you cannot adjust the pot to get to 11V unplug power and go back and check ever...

Страница 27: ...e amp in a bare board configuration You need to be very careful that the board doesn t sit down on anything metal or you risk causing a short and damaging something The BOM includes a plastic case tha...

Страница 28: ...f the solder is good the next most likely issue is that a component is installed incorrectly This can mean a part is installed the wrong orientation or a part is installed in the wrong place Look over...

Страница 29: ...MFR 25FBF52 1K 1 00KXBK ND Through Hole Metal Film Resistors 1 4W 1K ohm 1 0 12 0 24 4 R6 R7 R11 R16 KOA Speer MF1 4DC1500F 660 MF1 4DC1500F 603 MFR 25FBF52 150 150XBK ND Through Hole Metal Film Resis...

Страница 30: ...Appendix 2 Schematic You can also download this in PDF form from www pmillett com...

Страница 31: ...Appendix 3 Mechanical Drawing You can also download a DXF or PDF file at www pmillett com...

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