ABSOLUTE MAXIMUM RATINGS (Note 1). Maximum Temperatures. 2N/8/9. Storage Temperature. °C tOo+°C. Operating Junction Temperature. Part, 2n Category, Discrete. Description. Company, Central Semiconductor Corporation. Datasheet, Download 2n datasheet. Cross ref. Similar parts. Page 1. Adams Avenue, Hauppauge, NY USA. Tel: () • Fax: ()

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(PDF) 2N3568 Datasheet download

Hello, Please forgive me resurrecting such an ancient thread. All of these wires are single strand and a really thin gauge. Help me understand this power amp design – please? I guess I could tweak it to work but why bother since it’s practically a redesign of the whole thing.

However, there is an asterisk by Q9 and Q10 and a note that Q9 is replaced with a 2N for the amps using more than one speaker. Did you miss your activation email? Well obviously an input amp.

The two larger electrolytics are C20 and C I’m sure that the small size helps, but it is a very sturdy case. Where did you get the schematic? I thought about getting a schematic for the “Dirt Road Special” as it should be basically the same amp. The single chip is for the preamp.

After registering necessary to view the schematicI was surprised at how the power amp was almost identical!! The second amp is reversed in this regard. If you say theory and practice don’t agree you haven’t applied enough theory.

Without compound you leave microscopic air pockets in between. Seems a bit on the small side, even for 25 watts. They will break with the slightest nick, and several disconnected themselves as I was replacing the IC with a socket. I’ve done lots of research over the last two weeks and this is driving me nuts. Everything else is “loose” with a few wires bundled with a plastic tie.


One thing that seems odd about the schematic is that the value of Q5s collector resistor isn’t the same as the collector resistor of Q6. The speaker has been removed to provide some extra room to work with. I replaced them with 75 volt units just because it was easy to do since I had the board out anyway and it is a real pain to get the board out.

June 26, Of the two circuit boards, the smaller one at the bottom is the Small Stone dataheet effect. Q9 and Q10 is a complementary Class B driver stage. Hope this information is of use to someone. Similar strips are used to build up the front edge to hold the grille cloth and for the baffle to screw into.

Chalk it all up to very good luck, but it’s not just “my opinion”.

How can the base of Q6 2n356 more negative i. What totally confuses me is the lack of a DC path to establish the bias. The collectors of the output transistors are tied together.

The trace under the screw to the upper left connects to the output capacitor C Up to this point I am somewhat satisfied. It sort of looks like the joining node of R21 and R23 should have a common reference – which, I suppose, would lead the complementary pair Q9 – Q10 to exhibit some gain as well a pretty nice invitation for instability by the way.

With the addition of this capacitor the amplifier actually begins to have some gain and that base bias is also essential.

Air is a very good insulator of heat, which is very bad.

December 01, The front baffle is plywood. There are quite a few other connections made with wire soldered to the top of traces. There are also holes in the boards left side in the picture where screws go through the case, through a round, roughly 1 inch long plastic spacer, through the board and a nut secures the screw at the bottom of the board.


Since I have this Dirt Road Special apart, I thought someone might like to see how it’s put together. I don’t understand that – during the early s Electro-Harmonix would sell you the amp in kit form, so I would think there would be at least some dated before The preamp and power amp are combined onto the larger board. The purple wire is one of the speaker connections. The “rats nest” of wires tie the power supply to the circuit boards. Thanks for the confirmation that it won’t work as drawn!!

I guess I don’t understand why that would lead to instability. The six TO transistors and the two TO-3s make up the power amp. If the input caps are showing something other than a value of “1”, refresh your browser.

2N Datasheet(PDF) – New Jersey Semi-Conductor Products, Inc.

However, information on this amplifier is criminally rare, and this thread has some of the best discussion to be found. Q7 and Q8 had me confused until I realized the only way it could possibly work was push-pull Class A. I think my assumption is a voltage reference.

It does seem to have an incomplete or maybe sloppy feel to it – the component numbers jump around, there are holes in the sequence, some components don’t have numbers just values.