Help with resistors
Re: Help with resistors
Colors may even change if the resistor is burned or heatup too much.
- 1024MAK
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- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Help with resistors
You need a good white light, some artificial lights may mislead you as to the colour of some of the bands...PokeMon wrote:Colors may even change if the resistor is burned or heatup too much.
Here is two photos of the cardboard calculator produced by Maplin Electonics many years ago (some time in the 1990's):- Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Help with resistors
...which is totally wrong according to what they have sold from the mid 90s till now...
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- Joined: Sat May 10, 2008 2:31 am
Re: Help with resistors
Here is a quick chart that may help:
- 1024MAK
- Posts: 5118
- Joined: Mon Sep 26, 2011 10:56 am
- Location: Looking forward to summer in Somerset, UK...
Re: Help with resistors
Well, they probably changed supplier, but never updated their catalogue. When they sent out/sold their cardboard calculator, they were selling the type with the same colour code. Later they introduced a 250mW type which had a normal colour code. I bought some of these.gozzo wrote:...which is totally wrong according to what they have sold from the mid 90s till now...
Now get my most of my electronic components from other suppliers.
My point was, there are various different colour coding systems in use. So keep your mind sharp and your eyes open
Mark
ZX81 Variations
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
ZX81 Chip Pin-outs
ZX81 Video Transistor Buffer Amp
Standby alert
There are four lights!
Step up to red alert. Sir, are you absolutely sure? It does mean changing the bulb
Looking forward to summer later in the year.
Re: Help with resistors
Nice chart thanks for that.
Re: Help with resistors
I have some components I have difficulty identifying.
The components' texts are:
The components' texts are:
Code: Select all
+ ,1 35
4P7
4.00
Re: Help with resistors
From left to right (as best as an be seen on picture):
0.1uF/35V tantalum capacitor (take attention on polarity, + indicating positive leg)
4.7pF ceramic capacitor
4.00 MHz resonator
0.1uF/35V tantalum capacitor (take attention on polarity, + indicating positive leg)
4.7pF ceramic capacitor
4.00 MHz resonator
Re: Help with resistors
Two caps and a ceramic resonator.
L to R, a capacitor. Possibly tantalum. Polarised, cathode marked with a +. Middle is a cute little 4.7 picofarad cap. Unpolarised. The rightmost is a 4 MHz resonator. Centre is ground, outer pins connect to crystal/resonator inputs on a controller or input to clock generator. They are simple devices, not regarded as accurate. Cheap and cheerful wouldn't be a dishonourable description of them. Used in a zeddy so there you go
L to R, a capacitor. Possibly tantalum. Polarised, cathode marked with a +. Middle is a cute little 4.7 picofarad cap. Unpolarised. The rightmost is a 4 MHz resonator. Centre is ground, outer pins connect to crystal/resonator inputs on a controller or input to clock generator. They are simple devices, not regarded as accurate. Cheap and cheerful wouldn't be a dishonourable description of them. Used in a zeddy so there you go
Re: Help with resistors
Ha, beaten by Karl - that'll teach me for typing too many words