RB1 7
RAMSEY RB1 PARTS LIST Semiconductors
❒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)
Resistors
❒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)
Capacitors
❒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)