Instruction manual

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38
L2 Inductor, fixed, 220µH; ACT Co. C4-221K
Q1 Transistor, PNP; Motorola MJE350
Q2 Transistor, NPN; Motorola MJE340
Q3,4,8,9,10,11 Transistor, NPN; (open Mfgr.) 2N3904
Q5,6,7 Transistor, PNP; (open mfgr.) 2N3906
Q12 Transistor, NPN; (open mfgr.) 2N5088
Unless specifically noted by component reference designation below,
resistors are specified as follows:
a) Fixed resistors with values carried to decimal places implying a 1%
tolerance (example: 3.01K, 10.0K, 15.0K, 332K) are ¼-watt, 1% metal
film type.
b) Fixed resistors with values typical of 5% tolerance (example: 220,
3.3k, 10K, 270K) are ¼-watt, 5% carbon film type.
c) Multi-Turn Trimming Potentiometers (front-panel adjustable)
are Beckman 89PR series, Tokos RJC097P series, or equivalent
“cermet” types.
d) Single-Turn Trimmers (circuit board) are Beckman 91AR series or
Tokos GF06U1 series.
R64 Resistor, Variable, 5K; Piher PT-15-YB-5K with Fig. 3 spindle. Uses
Rogan 1R00A110BD001/PT-0-WL knob.
R145 Resistor, Variable, 10K; Piher PT-15-YB-10K with Fig. 3 spindle. Uses
Rogan 1R00A110BD001/PT-0-WL knob.
S1 Switch, DPDT Slide, Voltage Selector; C&K V202-12-MS-02-QA
S2,3,4 Switch, SPDT Miniature Toggle; C&K 7101-M-D9-A-B-E
S501 Switch, Power Rocker; Carling RA 911-RB-O-N
T1 Power Transformer, PC-mounting; Signal LP-20-600 or direct cross-
reference
Y1 Crystal 1.216MHz; SPECIAL - Inovonics Part No. 1242
MAIL-ORDER COMPONENT SUPPLIERS
The following electronic component distributors have proven to be
reputable suppliers of both large and small quantities of parts. Any
semiconductor, IC, capacitor, resistor or connector used in the DAVID-II
is probably available from one or more of these firms. Each supplier
publishes a full-line catalog available free for the asking.
Mouser Electronics — Call [phone]
Digi-Key Corporation — Call [phone]
ACTIVE (div. of Future Electronics) — Call [phone]