Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
i am probaly missing something here but from my understanding of the way a 5x7 LED matrix is wired you cannot for example turn on 1:1 , 1:3 and 2:1 without also turning on 2:3 but this does not seem right can anyone help plz?
im not sure about the others but the voltage when charged is 1.2 volts
so if you were to use two in series then you would only get 2.4volts not the three that you would get from two standard alkaline batteries
does anybody have the datasheet for 4045 the full is HBF4045AE 1P848 i searched on google but counldnt find anything
i jus found a couple of them in an a old box when is was clearing up and wondered if they did anything useful.
thank you for any replies
hey JimB i think your right i had a 555 astable circuit afew weeks ago where i had to do the same thing :) but i supose it is abit easier to get someone else to do it for you :lol:
i want to make a power supply for an amp i built using two tda2030s. i have a transformer that gives out 15V and a bridge rectifier that can handel up to about 4amps at 50V (is that ok to use?) so that i dont damage the amp i wanted to regulate it, i looked around and found a voltage...
i gave up on using an echant ages ago cos the best i could was at best amess ( a few distinguisable tracks), and i got a small mini dril/engaver for about £25 and just cut lightly along the edges of the tracks and it works a treat
1. it doesn't leave any mess on the copper
2. it can do...
i have a sony str-d515 "audio/video control center" (home cinema)
but i just use it in stereo operation. but the problem is that the left rihgt balance has worn out so the left channel will not work properly with the right channel. so my idea aws that i would replace the pot with fixed...
i use a paint/varnish stripper just dip the piece in for 10-20m seconds then take out and wipe with cloth nice and clean and it doesnt damage the wire
(i confess before this i used a sisscor blade)
i want to build this circuit to power some speakers for my pc but there is a few points i would like help with
where would i put a volume control in this circuit
i need a psu for it ,i have a transformer with an output of 17v that i can
use.
just generally i was wonder if there is a quicker way for finding equivalents of transistor rather than going through loads of datasheets to find a match or equivalent
thanks for your help
does anybody know any good tutorials for learning how to design transistor amps(just fairly low power ones under about 25w)
ive got a fairly good understanding of most components and some expirience with designing small projects using 555 timer and some h-bridges.
thank you.
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