Questions tagged [component-values]

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3
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3answers
373 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 "...
1
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3answers
118 views

Identify unknown capacitor and resistor values

How can I find out what the values of R12 and C3 are?
0
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1answer
83 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
407 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 ...
0
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2answers
146 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
113 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 ...
1
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2answers
205 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\$. ...
1
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2answers
491 views

TBD resistor & capacitor

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 ...
0
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2answers
142 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
2k 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
351 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, ...
0
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2answers
2k 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
452 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
173 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
484 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 ...
1
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2answers
3k 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?
0
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3answers
569 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
138 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 ...
0
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1answer
253 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
843 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 ...
0
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2answers
199 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
5k 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/...
4
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1answer
971 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 ...
3
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2answers
90 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 ...