Ramsey URC1 Parts List Semiconductors | Ramsey Electronics specification

RAMSEY URC1 PARTS LIST:

1 7805 5 volt power regulator (VR1)

1 145436 (or MC145436) 14 pin dip DTMF decoder IC (U5)

1 68HC705J2 20 pin dip pre-programmed microcontroller

(white sticker marked URC-1) (U6)

1 MAX7219 24 pin dip 8 digit display driver (U2)

1 MAX500 quad serial digital to analog converter (U7)

2 74HC595 serial latched shift registers (U1,U3)

1 DS1267 - 10 dual 10K digitally controlled potentiometer (U4)

6 seven segment LED displays (DSP1,2,3,4,5,6)

2 Red LEDs (D2,6)

2 1N4002 black epoxy diodes (D9, D10)

1 2N3904 NPN type transistor (Q2)

1 221-334-211 PNP or equivalent transistor (Q1)

5 .01uF disk ceramic capacitors (marked .01 or 103 or 10 nF) (C2,5,7,10,11)

1 .1uF disk ceramic capacitor (marked .1 or 104) (C8)

1 470pF disk ceramic capacitor (marked 470 or 471) (C9)

1 100uF to 220uF electrolytic capacitor (C15)

3 10uF electrolytic capacitors (C4,6,13)

1 47uF electrolytic capacitor (C14)

2 10K ohm (brown-black-orange) (R1,2)

4 47K ohm (yellow-violet-orange) (R4,5,6,7)

1 1M ohm (brown-black-green) (R3)

1 3.579 Mhz crystal (Marked 3.579 or 3.579264) (X1)

1 1/8" PC mounted minijack (J1)

1 Power jack (J2)

1 Set hardware for regulator (1 screw and 1 nut)

1 34 pin right angle connector (CON1)

1 13 pin right angle connector (CON2)

1 3.9VDC lithium backup battery (B1)

1 Main PC board

1 Display PC board

1 20 Pin IC socket

1 4 inches of #24 bus wire

URC1 • 7