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G8MNY > TECH 09.07.06 11:03l 92 Lines 4046 Bytes #999 (0) @ WW
BID : 37569_GB7CIP
Read: DL1LCA GUEST
Subj: Odd Resistance Finder
Path: DB0FHN<DB0RGB<DB0MRW<DK0WUE<I0TVL<F6CDD<F6GAQ<ON0BEL<GB7CIP
Sent: 060709/0818Z @:GB7CIP.#32.GBR.EU #:37569 [Caterham] $:37569_GB7CIP
From: G8MNY@GB7CIP.#32.GBR.EU
To : TECH@WW
By G8MNY (Updated May 06)
Resistors normally come in 2 ranges, E12 has 12 resistors evenly spaced per
decade, & E24 has 24 & includes the E12 series. As tolerances improve there
are also E24 & E48 ranges available!
E12 1.0 1.2 1.5 1.8 2.2 2.7 3.3 3.9 4.7 5.6 6.8 8.2
E24 + 1.1 1.3 1.6 2.0 2.4 3.0 3.6 4.3 5.1 6.2 7.5 9.1
Here is a useful list of just 128 values obtained with two E12 resistors.
Multiply or Divide by 10s for the range needed.
Wanted How Wanted How
1020 1k2//6k8 3590 5k6//10k
1031 1k5//3k3 3600 1k8+1k8
1047 1k2//8k2 3700 1k+2k7, 1k5+2k2
1071 1k2//10k 3717 6k8//8k2
1080 1k8//2k7 3900 1k2+2k7
1083 1k5//3k9 4000 1k8+2k2
1100 2k2//2k2, 1k+100 4048 6k8//10k
1137 1k5//4k7 4100 8k2//8k2
1165 1k8//3k3 4200 1k5+2k7
1182 1k5//5k6 4300 1k+3k3
1212 2k2//2k7 4400 2k2+2k2
1229 1k5//6k8 4500 1k2+3k3
1232 1k8//3k3 4505 8k2//10k
1269 1k5//8k2 4800 1k5+3k3
1301 1k8//4k7 4900 1k+3k9, 2k2+2k7
1304 1k5//10k 5000 10k//10k
1320 2k2//3k3 5100 1k2+3k9, 1k8+3k3
1350 2k7//2k7 5400 1k5+3k9, 2k7+2k7
1362 1k8//5k6 5455 10k//12k
1406 2k2//3k9 5500 2k2+3k3
1423 1k8//6k8 5700 1k+4k7, 1k8+3k9
1476 1k8//8k2 5900 1k2+4k7
1485 2k7//3k3 6000 12k//12k, 10k//15k, 2k7+3k
1497 2k2//4k7 6100 2k2+3k9
1525 1k8//10k 6200 1k5+4k7
1580 2k2//5k6 6429 10k//18k
1596 2k7//3k9 6500 1k8+4k7
1650 3k3//3k3 6600 1k+5k6, 2k7+3k9, 3k3+3k3
1662 2k2//6k8 6667 12k//15k
1715 2k7//4k7 6800 1k2+5k6
1735 2k2//8k2 6875 10k//22k
1788 3k3//3k9 6900 2k2+4k7
1803 2k2//10k 7100 1k5+5k6
1822 2k7//5k6 7200 18k//12k, 3k3+3k9
1933 2k7//6k8 7297 10k//27k
1939 3k3//4k7 7400 1k8+5k6, 2k7+4k7
1950 3k9//3k9 7500 15k//15k
2000 1k+1k 7674 10k//33k
2031 2k7//8k2 7765 12k//22k
2071 3k3//5k6 7800 1k+6k8, 2k2+5k6, 3k9+3k9
2126 2k7//10k 7959 10k//39k
2131 3k9//4k7 8000 1k2+6k8, 3k3+4k7
2200 1k+1k2 8182 15k//18k
2222 3k3//6k8 8246 10k//47k
2299 3k9//5k6 8300 1k5+6k8, 2k7+5k6
2350 4k7//4k7 8308 12k//27k
2353 3k3//8k2 8485 10k//56k
2400 2k2+2k2 8600 1k8+5k6, 3k9+4k7
2479 3k9//6k8 8718 10k//68k
2481 3k3//10k 8800 12k//33k
2500 1k+1k5 8900 3k3+5k6
2555 4k7//5k6 8913 10k//82k
2700 2k7, 1k2+1k5 8919 15k//22k
2779 4k7//6k8 9000 18k//18k
2800 5k6//5k6, 1k+1k8 9091 10k//100k
2806 3k9//10k 9176 12k//39k
2988 4k7//8k2 9200 1k+8k2
3000 1k2+1k8, 1k5+1k5 9400 1k2+8k2, 4k7+4k7
3071 5k6//6k8 9500 2k7+6k8, 3k9+5k6
3197 4k7//10k 9559 12k//47k
3200 1k+2k2 9643 15k//27k
3300 3k3, 1k5+1k8 9700 1k5+8k2
3328 5k6//8k2 9882 12k//56k
3400 6k8//6k8, 1k2+2k2 9900 18k//22k
// = in parallel, + = in series
Series combinations are better for high voltages.
Similar values spread the power dissipation more evenly.
So now you can replace that experimental preset value with 2 fixed value Rs.
Why Don't U send an interesting bul?
73 De John, G8MNY @ GB7CIP
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