Ramsey Electronics FR146 Instruction Manual download pdf (Page 12)

SR-1 – 12

 26. Install C15, .01 µF (marked .01, 103 or 10nF).

 27. Install C7 and C8, both 100 pF (marked 100, 101 or 100K).

 28. All four transistors used in the SR-1 are identical NPN type 2N3904

or similar. Transistors are installed just like any other part - don't be

afraid to use enough heat to make good, clean connections. When

installing transistors, gently work their three leads to slide into the three

holes at the same time, don't try to pre-form the wires. Press firmly

without jamming too hard.

 29. Install NPN transistor Q1 per step #29.

 30. Install NPN transistor Q2 per step #29.

 31. Install C11, .01µF (marked .01, 103 or 10nF).

 32. Install R7, 47K [yellow-purple-orange].

 33. Install R6, 1K [brown-black-red].

 34. Install C10, .01 µF (marked .01, 103 or 10nF).

 35. Install R8, 47K [yellow-purple-orange].

 36. Install R9, 1K [brown-black-red].

 37. Install C12, .01 µF (marked .01, 103 or 10nF).

 38. Referring to Step 29, install NPN transistor Q3.

 39. Install 1N270 glass bead diode D2. The banded end (cathode)

MUST be oriented as shown on parts layout.

 40. Install C13, .01 µF (marked .01, 103 or 10nF).

 41. Install R11, 10K [brown-black-orange].

 42. Install R13, 100K ohms [brown-black-yellow].

 43. Install R12, 100K ohms [brown-black-yellow].

 44. Install R14, 1 megohm [brown-black-green].

 45. Refer, if necessary, to Step 7 regarding the NE602 IC already

installed. Install U2, the LM358 IC, making very sure that its notched end

is toward the front of the PC board.

 46. Install C14, .01 µF (marked .01, 103 or 10nF).

 47. Install Jumper Wire, JMP2.

 48. Install R10, 10K [brown-black-orange].

 49. Install R15, 47K [yellow-purple-orange].

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Ramsey Electronics FR146 Instruction Manual Page 12