Wiring circuit

 Here is a small table available zener diodes that is ideal for anyone working in maintenance and also for developers of electronic circuits. This are the most common codes in Brazil zener diodes, zener diodes also exist that have bands of color as the resistors, to know their values ​​must use the same process of the resistors. Remembering that most diodes have a tolerance of 5%.

Table 0.5 Watt Zener Diodes

1N746 – 3V3
1N747 – 3V6
1N748 – 3V9
1N749 – 4V3
1N750 – 4V7
1N751 – 5V1
1N752 – 5V6
1N753 – 6V2
1N754 – 6V8
1N755 – 7V5
1N756 – 8V2
1N757 – 9V1
1N758 – 10V
1N962 – 11V
1N759 – 12V
1N964 – 13V
1N965 – 15V
1N966 – 16V
1N967 – 18V
1N968 – 20V
1N969 – 22V
1N970 – 24V
1N971 – 27V
1N972 – 30V
1N973 – 33V
1N974 – 36V
1N975 – 39V
1N976 – 43V
1N977 – 47V
1N978 – 51V
1N979 – 56V
1N980 – 62V
1N981 – 68V
1N982 – 75V
1N983 – 82V
1N984 – 91V
1N985 – 100V

Table 1 Watt Zener Diodes

1N4728 – 3V3
1N4729 – 3V6
1N4730 – 3V9
1N4731 – 4V3
1N4732 – 4V7
1N4733 – 5V1
1N4734 – 5V6
1N4735 – 6V2
1N4736 – 6V8
1N4737 – 7V5
1N4738 – 8V2
1N4739 – 9V1
1N4740 – 10V
1N4741 – 11V
1N4742 – 12V
1N4743 – 13V
1N4744 – 15V
1N4745 – 16V
1N4746 – 18V
1N4747 – 20V
1N4748 – 22V
1N4749 – 24V
1N4750 – 27V
1N4751 – 30V
1N4752 – 33V
1N4753 – 36V
1N4754 – 39V
1N4755 – 43V
1N4756 – 47V
1N4757 – 51V
1N4758 – 56V
1N4759 – 62V
1N4760 – 68V
1N4761 – 75V
1N4762 – 82V
1N4763 – 91V
1N4764 – 100V

Table 5 Watt Zener Diodes

1N5333 – 3V3
1N5334 – 3V6
1N5335 – 3V9
1N5336 – 4V3
1N5337 – 4V7
1N5338 – 5V1
1N5339 – 5V6
1N5340 – 6V0
1N5341 – 6V2
1N5342 – 6V8
1N5343 – 7V5
1N5344 – 8V2
1N5345 – 8V7
1N5346 – 9V1
1N5347 – 10V
1N5348 – 11v
1N5349 – 12v
1N5350 – 13v
1N5351 – 14V
1N5352 – 15V
1N5353 – 16V
1N5354 – 17V
1N5355 – 18V
1N5356 – 19V
1N5357 – 20V
1N5358 – 22V
1N5359 – 24V
1N5360 – 25V
1N5361 – 27V
1N5362 – 28V
1N5363 – 30V
1N5364 – 33V
1N5365 – 36V
1N5366 – 39V
1N5367 – 43V
1N5368 – 47V
1N5369 – 51V

Table of zener diodes BZX line

Line BZX79 .5 Watt of power voltage of 2.4 Volts 68
Line BZV60 .4 Watts power voltage of 2.4 V to 68 Volts
Line BZT03 power of 3.25 Watts 7.5 V voltage to 270 Volts
Line BZW03 power of 6 Watts 7.5V voltage to 270 Volts

VOLTAGE VOLTS WATTS


1N746A     BZX79C3V3     3,3     0,5
1N747A     BZX79C3V6     3,6     0,5
1N748A     BZX79C3V9     3,9     0,5
1N750A     BZX79C4V7     4,7     0,5
1N751A     BZX79C5V1     5,1     0,5
1N752A     BZX79C5V6     5,6     0,5
1N753A     BZX79C6V2     6,2     0,5
1N754A     BZX79C6V8     6,8     0,5
1N755A     BZX79C7V5     7,5     0,5
1N756A     BZX79C8V2     8,2     0,5
1N757A     BZXT9C9V1     9,1     0,5
1N758A     BZX79C10     10     0,5
1N962B     BZX79C11     11     0,5
1N759A     BZXT9C12     12     0,5
1N964B     BZX79C13     13     0,5
1N965B     BZX79C15     15     0,5
1N966B     BZX79C16     16     0,5
1N967B     BZX79C18     18     0,5
1N968B     BZX79C20     20     0,5
1N969B     BZX79C22     22     0,5
1N970B     BZX79C24     24     0,5
1N971B     BZX79C27     27     0,5
1N972B     BZX79C30     30     0,5
1N973B     BZX79C33     33     0,5
1N4728A BZX81C3V3     3,3     1
1N4729A BZX81C3V6     3,6     1
1N4730A BZX81C3V9     3,9     1
1N4731A BZX81C4V3     4,3     1
1N4732A BZX81C4V7     4,7     1
1N4733A BZX81C5V1     5,1     1
1N4734A BZX81C5V6     5,6     1
1N4735A BZX81C6V2     6,2     1
1N4736A BZX81C6V8     6,8     1
1N4737A BZX81C7V5     7,5     1
1N4738A BZX81C8V2     8,2     1
1N4739A BZX81C9V1     9,1     1
1N4740A BZX81C10     10     1
1N4741A BZX81C11     11     1
1N4742A BZX81C12     12     1
1N4743A BZX81C13     13     1
1N4744A BZX81C15     15     1
1N4745A BZX81C16     16     1
1N4746A BZX81C18     18     1
1N4747A BZX81C20     20     1
1N4748A BZX81C22     22     1
1N4749A BZX81C24     24     1
1N4750A BZX81C27     27     1
1N4751A BZX81C30     30     1
1N4752A BZX81C33     33     1

VOLTS      0,5W     1W      5W
2,4     1N5221B     ————     ———–
2,7     1N5223B     ————     ———–
3.0     1N5225B     ————     ———–
3.3     1N5226B     1N4728A     1N5333B
3,6     1N5227B     1N4729A     1N5334B
3,9     1N5228B     1N4730A     1N5335B
4,3     1N5229B     1N4731A     1N5336B
4,7     1N5230B     1N4732A     1N5337B
5,1     1N5231B     1N4733A     1N5338B
5,6     1N5232B     1N4734A     1N5339B
6,0     1N5233B     ————-     1N5340B
6,2     1N5234B     1N4735A     1N5341B
6,8     1N5235B     1N4736A     1N5342B
7,5     1N5236B     1N4737A     1N5343B
8,2     1N5237B     1N4738A     1N5344B
8,7     ———–     ————-     1N5345B
9,1     1N5239B     1N4739A     1N5346B
10     1N5240B     1N4740A     1N5347B
11     1N5241B     ————-     1N5348B
12     1N5242B     1N4742A     1N5349B
13     1N5243B     1N4743A     1N5350B
14     ———–     ————-     1N5351B
15     1N5245B     1N4744A     1N5352B
16     1N5246B     1N4745A     1N5353B
18     1N5248B     1N4746A     1N5355B
20     1N5250B     1N4747A     1N5357B
22     1N5251B     1N4748A     1N5358B
24     1N5252     1N4749A     1N5359B
27     1N5254B     1N4750A     1N5361B
28     ———–     ————-     1N5362B
30     1N5256B     1N4751A     1N5363B
33     1N5257B     1N4752A     1N5364B
36     1N5258B     1N4753A     1N5365B
39     1N5259B     1N4754A     1N5366B
43     1N5260B     1N4755A     1N5367B
47     1N5261B     1N4756A     1N5368B
51     1N5262B     1N4757A     1N5369B
56     1N5263B     1N4758A     1N5370B
62     1N5265B     1N4759A     1N5372B
68     1N5266B     1N4760A     1N5373B
75     1N5267B     1N4761A     1N5374B
82     1N5268B     1N4762A     1N5375B
91     1N5270B     1N4763A     1N5377B
100     ———–     1N4764A     1N5378B
120     ———–     ————-     1N5380B
150     ———–     ————-     1N5383B
200     ———–     ————-     1N5388B

This is a Variable 5 to 20V DC Supply Circuit Diagram. If you are looking for a low drop voltage regulator that can provide a power supply of 1A with an output voltage of between 5V and 20V DC, National Semiconductor LM2941 Low Dropout Adjustable Regulator is that you can pick to make use of. Its a typical dropout voltage of 0.5V which means that the input supply need only must be 0.5V DC over the desired output voltage. 

 

Its other features include internal short circuit current limit and reverse battery protection. As shown in the schematic below, the regulator has five pins which consists of the ON/OFF control, Input Voltage, Output Voltage, Ground & Adjustable pins. ON/OFF is used for the purpose of switching on & off of the regulator. The capacitors C1 & E1 are to be placed as close as feasible to the regulator. 

The output of the circuit can be varied by varying the worth of potentiometer VR1 from 5V DC to 20V DC. The input voltage is limited from five.5V DC to 30V DC. Resistor R1 must be greater than 1K. The worth of the VR1 that needs to be set is calculated from the formula given below: 

VR1 = R1[(Vout/1.275) - 1] ohm

 If R1=1K, Vout = 5V, VR1 should be set to 2.9K ohm. 

 If R1=1K, Vout = 20V, VR1 should be set to 14.7K ohm

This solid-state push-pull single-ended Class A schema is capable of providing a sound comparable to those valve amplifiers, delivering more output power (6.9W measured across a 8 Ohm loudspeaker cabinet load), less THD, higher input sensitivity and better linearity. Voltage and current required for this schema are 24V and 700mA respectively, compared to 250V HT rail and 1A @ 6.3V filament heating for valve-operated amplifiers. The only penalty for the transistor operated schema is the necessity of using a rather large Heatsink for Q2 and Q3 (compared to the maximum power delivered).In any case, the amount of heat generated by this schema can be comparable to that of a one-valve amplifier. An optional bass-boost facility can be added, by means of R5 and C5.

Parts:

P1 = 47K
R1 = 100K
R2 = 12K
R3 = 47K
R4 = 8.2K
R5 = 1.5K
R6 = 2.7K
R7 = 100R
R8 = 100R
R9 = 560R-1/2W
R10 = 1R-1/2W
Q1 = BC560
Q2 = BD439
Q3 = BD439
C1 = 10uF-63V
C2 = 10uF-63V
C3 = 47uF-25V
C4 = 100uF-35V
C5 = 150nF-63V
C6 = 220uF-25V
C7 = 220uF-25V
C8 = 1000uF-25V
SPKR = 5W-8R Speaker

Notes: