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Color Band Black Brown Red Orange Yellow Green Blue Violet Gray White Gold Silver No color 1st Digit 0 1 2 3 4 5 6 7 8 9 2nd Digit 0 1 2 3 4 5 6 7 8 9 Multiplier 1 10 100 1,000 (K) 10,000 100,000 1,000,000 (M) 10,000,000 100,000,000 1,000,000,000 01 001 5% 10% 20% 1% 2% 3% 4% Tolerance
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This table provides the value of alphanumeric coded ceramic, mylar and mica capacitors in general They come in many sizes, shapes, values and ratings; many different manufacturers worldwide produce them and not all play by the same rules Some capacitors actually have the numeric values stamped on them; however, many are color coded and some have alphanumeric codes The capacitor s first and second significant number IDs are the first and second values, followed by the multiplier number code, followed by the percentage tolerance letter code Usually the first two digits of the code represent the significant part of the value, while the third digit, called the multiplier, corresponds to the number of zeros to be added to the first two digits
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1st Significant Figure 2nd Significant Figure Multiplier Tolerance 01 F 10% CSGNetworkCom 6/4/92
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104 k
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Value 15 pF 33 pF 10 pF 15 pF 20 pF 30 pF 33 pF 47 pF 56 pF 68 pF 75 pF 82 pF 91 pF 100 pF 120 pF 130 pF 150 pF 180 pF 220 pF 330 pF 470 pF 560 pF 680 pF 750 pF 820 pF
Type Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic Ceramic
Code
Value 1,000 pF /001 F 1,500 pF /0015 F 2,000 pF /002 F 2,200 pF /0022 F 4,700 pF /0047 F 5,000 pF /005 F 5,600 pF /0056 F 6,800 pF /0068 F 01 015 02 022 033
Type Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Ceramic / Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar Mylar
Code 102 152 202 222 472 502 562 682 103 203 223 333 473 503 563 683 104 204 224 334 474 564 105 205
101 121 131 151 181 221 331 471 561 681 751 821
047 05 056 068 1 2 22 33 47 56 1 2
Seven: Super-Regenerative Radio Receiver
Table 7-3
Short-wave band listening frequencies
Shortwave Band 120 meters = 2300 2495 kHz 90 meters = 3200 3400 kHz 75 meters = 3900 4000 kHz 60 meters = 4750 5060 kHz 49 meters = 5730 6295 kHz 41 meters = 6890 6990 kHz 41 meters = 7100 7600 kHz 31 meters = 9250 9990 kHz Shortwave Band 25 meters = 11500 12160 MHz 22 meters = 13570 13870 MHz 19 meters = 15030 15800 MHz 17 meters = 17480 17900 MHz 16 meters = 18900 19020 MHz 13 meters = 21450 21750 MHz 11 meters = 25670 26100 MHz
friction-driven by a small knob at the bottom of the set This allows fine tuning of stations To the upper left are the antenna and ground terminals Just to the right in a hole in the front panel is exposed the screw which adjusts the antenna coupling capacitor Below left is the filament rheostat knob At the upper right are the headphone terminals with the regeneration control located at the lower right Although the receiver as shown in the original drawings may appear complex, it really is not This is one of simplest receivers that you could build The original chassis for the Doerle receiver was an L-shaped piece of sheet metal, most likely steel, and painted with a black wrinkle finish While the front panel was perfectly rectangular, the base was trapezoidal Dimples were embossed into the base plate which served as feet For our replica Doerle receiver, you can start with an 11 9 sheet of 063 (1 16 ) aluminum to construct the chassis The most complicated mechanical problems that you may encounter in building the receiver is the mounting #19 dual triode tube up on standoffs, mounting the variable capacitors and building the coils on the coil-form, see Figure 7-4 The original Doerle model used a simple single bearing variable capacitor We elected to use a heavy duty Hammarlund tuning capacitor; it is of significantly higher quality and is much heavier, so you will have to support the rear end of the capacitor with a bracket of some type Once a Z-bracket as fabricated and attached to the breadboard, the prototype dial-drive-capacitor assembly was solid, yet turned smoothly
Since a solid, rigid mount for the tuning capacitor is essential if you are to achieve frequency stability and eliminate microphonics, you must get this part of the assembly correct And since your components will need their own custom mounting hardware, you ll need to experiment until you get it right That s why the breadboard prototype is so useful Take your time In continuing the capacitor assembly, I used a pair of 1 2 long 6-32 machine screws in the top and bottom pair of holes on the drive mechanism In the left-right pair of holes, I used a pair of 11 2 long 6-32 machine screws The extra length became mounting studs to which an aluminum cross-arm was attached In the cross-arm was drilled a 3 8 hole to accommodate the mounting flange of the capacitor After the capacitor holes were drilled, the burrs removed, and edges of the panel were rounded and smoothed, I roughed up the surface with fine sandpaper
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