Questions tagged [component-values]

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4answers
116 views

Silver band at 3rd from 5 band resistor

I need help to find this resistor value. They’re 5 band resistors and it has silver band at 3rd. I try to use online calculator but can't calculate this silver 3rd band. It’s a faulty resistor so I ...
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1answer
58 views

Defective Transformer Replacement

I've been working on repairing a TV psu, and discovered that the transformer in it is faulty (reading O.L. on every combination of pins except for diagonal in ohms mode on the DMM) I've been looking ...
42
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3answers
11k views

Why is the number 63 popular in electronics?

Capacitors have a voltage of 63V (not 60 or 65). Fuses have a value of 63A (not 60 or 65). And there exist more odd values in electronics... Who knows the history of this convention?
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2answers
70 views

Resistor with silver third band

This resistor, from the AC side of a power supply board, has a silver third ring and a white fifth ring. I've never seen such component before : It reads between 8 and 12 ohms on the multimeter and ...
0
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1answer
94 views

What's the purpose of the resistors and capacitors in this latching push button circuit?

I am trying to design a push button that turns my device on upon a single press and turns it off upon holding the push button for a few seconds. I found this circuit: Aside from the 10uF capacitor ...
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2answers
103 views

Conceptual vs real world signal transmission [closed]

When data or information is sent through any medium, (be it through phone lines, cable, fiber optics or through empty space or some other means), is it volts, current of charges, 0s and 1s, codes, ...
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2answers
282 views

SMD Resistor Power Rating Calculation

I'm extending my question from previously. How to find SMD resistor and capacitor value and correct size I'm doing some calculation and find something confusing below is the calculations: V = 5 R = ...
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0answers
57 views

Help identifying surface mounted component

While replacing the damaged screen on my wife’s Pixel 3a, I damaged one of the blue components below the FPC connector that connects the LCD assembly to the main board. Can someone tell me what these ...
2
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1answer
117 views

Identify SMD capacitor value

I'm repairing a Breville Smart Grinder circuit board and found that the issue is due to a bad capacitor. I have removed the said capacitor (C15 in the schematic below) and I am now wondering how to ...
1
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1answer
85 views

What are the values of these 2 resistors?

What are the values of the two highlighted resistors? Considering the brown band as tolerance and ignoring the first (black) band, I came to the conclusion that the values are 680 and 220 milliohms. ...
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0answers
41 views

Typical rms values for random jitter in satellite communication

I'm trying to find typical values for random jitter in satellite communication and I'm not really finding any values in any documents. Most of the time I only find definitions for different jitter ...
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1answer
118 views

Capacitor values

I don't have high-end multimeter. So, anybody please tell me the values of the following capacitors.
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2answers
89 views

Variable resistors - resistance value meaning

I'm normally using in my circuit board a 10K variable resistor. Those specific 10k variable resistors are no longer in my supplier stock for now and I was wondering if I can place a 200k variable ...
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3answers
220 views

Help Identifying Inductor From a Schematic

I’m repairing a laptop but I don’t know what value inductor to use/get. The schematic has values, I just don’t know how to interpret other than it’s a 2mm inductor. It’s labeled 5A_Z120_25M_0805_2P on ...
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3answers
5k views

How do I change the output voltage of the LM7805?

I read in the LM7805 datasheet that I can change the output voltage to not only 5 V, but to another value by changing the circuit resistance. How do I do that? From what I understand, to change the ...
3
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3answers
933 views

Does "1KV" on this disc capacitor mean 1 kiloVolt?

One of my power supplies died. Investigation turned out that this capacitor is broken. "102" means 1nF, but does "1 KV" mean 1 kiloVolt or is that some sort of tolerance code? I've tried several "...
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3answers
609 views

Identify unknown capacitor and resistor values

How can I find out what the values of R12 and C3 are?
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1answer
90 views

Can someone help me identify what the value of this capacitor is? [duplicate]

I have an older computer and as I was pulling the graphics card my fingers slipped and I pulled this off the board... Problem is I can't find one with the same markings so I need to find a replacement....
2
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1answer
573 views

How can I identify these capacitor values?

I’m trying to build the power supply from this schematic. I’ve been purchasing the parts, but am confused about the capacitors I’ve labeled, especially became their numbers start with “R”. What are ...
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2answers
228 views

Uses for 49.9Ω resistors? [duplicate]

It seems that both 49.9Ω and 50Ω resistors are a thing: https://www.mouser.co.uk/Passive-Components/Resistors//N-5g9n?P=1z0wnltZ1z0wljo https://www.mouser.co.uk/Passive-Components/Resistors//N-5g9n?P=...
1
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1answer
347 views

Condition for the output and input impedance for cascading electronic circuits

For cascading a system that have an output impedance of \$R_1\$ and an op amp that has an input impedance of \$R_2\$ then in order to use a isolated model we need a value for \$R_2\$ that is minimal ...
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2answers
486 views

Does the resistor values used for opamp circuits come from the equations?

I've the following circuit: I used the LM741 as the opamp. The input resistance is \$2\cdot10^6\space\Omega\$, the output resistance is \$75\space\Omega\$ and the voltage gain is \$2\cdot10^5\$. ...
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2answers
2k views

TBD resistor & capacitor(TBD means "To Be Discussed")

I’m building the * DN05017/D power supply from ON Semiconductor. This is the datasheet of the power supply with schematic and BOM So now while searching for the components, I noticed on the schematic ...
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2answers
242 views

Will this MOSFET Work in this circuit?

I have designed printed circuit board for a project that requires a (logic-level) MOSFet controlled directly by an AVR micro at 5 volts feeding a step-up transformer. The boards have already been ...
1
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1answer
5k views

What is the value of this capacitor?

I have a bunch of these, and I can't remember what I thought they were when I bought them. I've googled a ton of possible (yet conflicting) potential value options. Looking for some expert advice. ...
2
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1answer
1k views

Adapting an HF attenuator to higher power

I want to make a 25W HF amplifier that can handle an input up to 8W. I found a schematic by ON6MU which can handle up to 2.5W input. There is an attenuator at the input that I copy here. R3-4 is 1W, ...
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2answers
6k views

Tantalum Cap Code Explained

I need to replace the following cap: It was placed at the input of a device that runs off 24Vdc, like the following schematic. simulate this circuit – Schematic created using CircuitLab I'm ...
1
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1answer
904 views

Y Capacitor Value Confusion

I was cleaning my 36v dc 5.5 amp SMPS today. I was playing around with the wires and goofed up. A spark happened and later I found that a Y Cap had cracked. This cap value is: Yf222m 2200pf 250v x1:...
2
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2answers
224 views

How could I go about determining the component values of the described filter? I know what they are, but not how to get them using proper formulas

The filter in question takes a mono signal of amplitude between 5 mVp and 200 mVp, and filters the signal based on the frequency. The potentiometer that leads into the inverting input of the op amp ...
0
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2answers
604 views

Capacitors minimum value

When the manufacturer recommends some capacitors with specific values, can I choose caps with more capacitance? Will it give any advantage? For example decoupling caps at MCU power pins. Or LDO input ...
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2answers
5k views

What happens if I change the value of a coupling capacitor in a tube pre-amp

I own a Blackheart BH1H amplifier and am considering making modifications to change its sound. The schematic can be found here One change I have seen suggested is to change the value of C2 from it's ...
22
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2answers
4k views

Why are there 3.15A fuses?

Why are there 3.15A fuses? Did someone decide that \$\pi\$A was a good rating? Or is it \$\sqrt{10}\$A they're aiming for? Is it even possible to make fuses with better than +/-5% tolerance?
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3answers
907 views

What value PTC Thermistor should I choose for over-current protection for a child's electronics kit?

What is an appropriate value for a PTC thermistor used in a 3-cell AA battery pack to provide over-current protection if the terminalsare shorted? Current draw during normal operation will be only a ...
0
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1answer
229 views

Passive components swapping and replacement

I am trying to writte a small note for our staff when they purchase components. Quite often some resistors, capacitor, inductor, diode and transistor (NPN and MOSFTET) may not be availble on the ...
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1answer
437 views

Read Thyristor(Triac) specification

I have this Triac which I believe is failed because of a hight current we had in the house. The varistors that were next to it were totally burned. I am trying to buy some online, but I really don't ...
4
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1answer
2k views

Possible to identify burnt component and its value?

The device is a Banana Pi M3, I accidentally short it out when I was playing around with my multimeter on the GPIO pins.... A noticeable spark came from that component in the above picture circled in ...
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2answers
283 views

how can i choose my inductance? [duplicate]

I calculated my inductance value and current rating but I can't decide which inductance I have use. for example 10uH, max 800mA my inductance values but there is other variables.in this topic I have ...
11
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3answers
6k views

Choose the better values (in terms of range) for resistors in this non-inverting op-amp circuit

These days I'm looking at operational amplifiers; from what I've seen, implementing them in a circuit is quite simple, at least when they are connected as "non-inverting". Determining the gain/...
6
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1answer
2k views

4/5 band resistor - extra black band

I have two resistors which need to be replaced. I tried to determine the value, but it can't make sense of these black bands: For reference the bands are: brown - silver - green - brown - black ...
4
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2answers
96 views

Components with multiple possible values - how to designate on schematic?

Quite often it happens to me that values of resistors or capacitors don't play such a significant role. This is mainly the case with decoupling capacitors and e.g. LED series resistors. Often in ...