Electronics Forum / Basics / March 2007

A curcuit I would like to build calls for a 6 amp. 200 volt SCR. I
can't seem to find that particular component and was wondering if I
could use a SCR that is rated for 200 volts but has a amperage rating
of over 6. After reading a little bit about SCRs I think the voltage

For my next project I've just built a PSU using a small 9V-transformer.
Hooking it up to a Graetz-bridge for rectification, I measure 9.5 volts
over Vcc/GND (i.e. over "+" and "-" on the bridge) using my DMM.
Now I'm going to add filter caps. What I'm unsure of here is if

a request for a circuit/layout for light switching that will turn on
low level lights 2 or 3 steps in front & 1 behind as a person walks
along a corridor or up/down stairs. Component list & values would also
be required if possible. My thanks for your consideration.

Hello all..
 I'm a newbie.. well sort of..  Now, don't flame me! LoL.  I don't
know a lot about electronics.  A lot of stuff I have forgotten over
the years about it.  It seems I need to fill in the gaps in my

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Is it possible to create two phase(or more) from single phase using passive
components(definitely not any motors) and maybe transistors(or
semi-conductors)? The design would need to handle large currents and
voltages so one can't directly use an summing op amp or anything like ...

First off, big thanks to everyone for the overwhelming amount of help I
received.
I've been playing around with LC oscillators and other RF like things lately
and I decided to try my hand at making a superhet WWV receiver.  Not being

Can i get some help in understanding or some help regarding sensing
the radiation emitted by the human body, i recently sensed a very
feeble signal from humans using a CRO, the freq was in the range of
60us .... and had its peak amplitude at around .2 - .3 V   any

Hi, i was wanting to construct a simple circuit where a led would
flash together with a Music BPM. Does anyone knows how it can be done.
And what will i need to buy?
OK

Got my new Extech MM560 today, pretty cool.  Haven't had much opportunity to
play with it much yet, but I did a few measurements just to see how the 15
year old Micronta was holding up.
On an old 6V battery I use for tinkering I get this.

I am working on a project with a new wireless technology from the firm
Nanotron (based in Germany).... Does somebody work with this
technology ? or has information abour it ?
thx

I have a circuit for driving large piezo elements, but I can't seem to find
large elements anywhere. I'm talking large enough to be driven by 1kV.
Anyone know of a good source?
Thanks for any help.

I have some rechargable wireless headphones that I use on the
treadmill.  The NiCads have developed so much memory that they only
last about 1/2 hour.
Can I replace them with NiMH?  Will the charging dock handle them the

Once upon a time this was easy to get in small quantities (25' - 100')
but now it seems like 500' or more is the norm. I'm looking for 26 or
28 AWG 4 conductor **tinned** copper shielded cable in 25' to 100'
quantities and just can't seem to find it at the usual Digikey/Jameco/

I have a little project that I am undertaking that requires accurate
position feedback and I thought of using a similar approach to the way
hard drive headers are used for positioning, afterall they are
extremely accurate and fast. The difference is that I need to be able