abelpratt

Pin 8 of the IC should be 5.0V which is the output of the 78L05 voltage regulator or the 6V battery voltage. If you use the voltage regulator and D1 in series with it, then the minimum input voltage is 8.2V. Don't use a 9V battery because its voltage quickly falls lower.

The micromitter has an attenuator of 3 resistors at its output to reduce its range. Remove the attenuator for much greater range.

Hi all,

I'm new here.
I have just assembled a FM Micromitter (Miniature FM transmitter).

http://www.siliconchip.com.au/cms/A_102010/article.html

Construction went well with very few re soldered points (put a couple of things in the wrong way round, but hey I'm learning).

When I went to do the testing and adjustment it says that I should be reading 5v between TP GND and pin 8 of IC1 but I only get a reading of 2.5v.

Can anyone tell me why this might be and what the consequences of this might be.

It DOES transmitt (I am currently transmitting on 88.9) but I loose the signal after approx 8M from the antenna.  Is this related to my drop it voltage measured against what it should be?

Should I trim my antenna to a specific length?

Any comments or suggestions would be much appreciated.

Regards

David ???

I can't find SL100 & SK100 transistor :'(

Which transistors can replace these?

Thank you for your help~  ;)

I want to apply force for an extended amount of time (10 secs to a couple minutes) using a solenoid actuator. Unfortunately, it seems that solenoids use a lot of power when they are active. Is there a solenoid type that will only use power when switching between active and not active? There's probably a way I can do this with an external mechanism, but I was wondering if there may be commercial solenoids that have this built-in.

Thanks,
Jessica

Does anyone has LM3914 pspice library? i desperately need it..pleeeeease!

At last i got a theori from a totally different place and he wasn't shure either but
he had a weak memory that it could be 1A16 and a PNP transistor but after several
deep searches on the I-net it didn't make any kind of senses whatsoever  ???

In a few circuit diagrams i have they refer to a what seems to me is a transistor
with B C E as a overload protector and with number A16 and i have looked for a few hours on the net and i can't find anything on this little fellow,
Anyone knows what I'm looking for and wanna share that info Please ....

Come on !! 48 visits !! some one must know what it is !!! PNP is it also...........