Ramsey RB1 Parts List

❒1 4001 Quad dual input NOR gate (U3)

❒1 XR-2209 voltage controlled oscillator (U2)

❒1 NE555 timer (U1)

❒2 2N3904 NPN transistors (TO92 package marked 3904) (Q3,4)

❒2 221-334 PNP transistors (Flat TO92 package marked 221-334) (Q1,2)

❒1 1N4002 rectifier diode (D1)

❒1 Large red LED (D2)

❒4 6.2 ohm resistors [blue-red-gold](R12,R13,R14,R15)

❒1 2.2K ohm resistor [red-red-red](R16)

❒1 3.9K ohm resistor [orange-white-red](R10)

❒1 4.7K ohm resistor [yellow-violet-red](R8)

❒1 6.8K ohm resistor [blue-gray-red](R7)

❒2 10K ohm resistors [brown-black-orange](R6,R11)

❒1 22K ohm resistor [red-red-orange](R1)

❒2 47K ohm resistors [yellow-violet-orange](R5,R9)

❒1 100K ohm resistor [brown-black-yellow](R3)

❒2 150K ohm resistors [brown-green-yellow](R2,R4)

❒1 330uF electrolytic capacitor (C1)

❒3 10uF electrolytic capacitors (C4,C6,C7)

❒3 .1uF ceramic capacitors [Marked .1 or 104](C2,C3,C8)

❒1 .001 ceramic capacitor [Marked .001 or 102](C5)

Miscellaneous

❒1 3PDT power setting switch (S2)

❒1 SPDT power switch (S1)

❒1 Power jack (J1)

❒1 stereo jack (J2)

❒1 piezo power speaker horn (SP1)

Ramsey Electronics manual Ramsey RB1 Parts List