|Part||Description||Radio Shack #||DigiKey #||Notes|
|R1||47K resistor||271-1342||yellow purple orange gold|
|R2||470K resistor||271-1354||yellow purple yellow gold|
|R3||10K resistor||271-1335||brown black orange gold|
|R4||560 Ohm resistor||560QBK-ND||green blue brown gold|
|R5||100K potmeter + switch||Linear, not audio|
|R6||270 ohm resistor||271-1314||red purple brown gold|
|C1||Capacitor, .05-.1uF||Ceramic, 50V type|
|C2||Capacitor, 0.1uF||272-1069||Ceramic, 50V type|
The 2N3392 transistor is a (cheap) low-power, low-noise, high-gain type in a TO-92 case and can be replaced by a NTE199 or ECG199.If you wish to use a TUN, cross reference the parameters with one of the units from this list: TUP-TUN
Potentiometer R5 of 100K is a linear type with an on/off switch attached.
The value of C1 may need to be between 0.05uF and 0.1uF (47nF/100nF). Experiment with the value for best performance.
Capacitor C3’s working voltage should be at least 16V.
Some replacements for the 2N3392 are (not verified):2N3392 (e-c-b) NTE199 (closest match) (e-c-b) BC168B and BC168CBC183LB and BC183LC BC238C BC548A and BC548C PBC109 KT373AERROR FIXED! The 2N3392 was shown with the ’b’ and ’c’ reversed.The above and the 2N3392 as shown in the layout diagram are correct. The base and collector legs have to be twisted (reversed) for the printed circuit board or the circuit will absolutely not work.Apologies for the error!
Note that the pinout for the 2N3392 is different from the substitutes.For the NTE199, a direct match, you have to twist the legs ofthe collector and base so they switch places (e-c-b instead of e-b-c) and that way fits into its place on the pcb.On a future date I will modify the pcb for both types of transistors.
A KIT for this circuit is available. Audio Booster
The phone number for DigiKey is 1-800-Digi-Key.