Search found 275 matches

by Enzo
Wed Jun 13, 2007 10:45 pm
Forum: General Discussion
Topic: How do I Fine tune a 78L05 ?
Replies: 50
Views: 10257

Unless I missed it, during this testing, is your load on the regulator? Is the load that will be on it stable or does it vary?
by Enzo
Thu May 25, 2006 12:20 am
Forum: General Discussion
Topic: How to trigger relay?
Replies: 10
Views: 2504

Exactly. My favorite general purpose small transistor is the MPSA06. 80v, 500ma, what's not to love? They cost about 5 cents from someplace like Jameco. (you have to buy 10 at that price though) I buy them by the hundred. And if the circuit doesn't have enough drive for the transistor, a darlington ...
by Enzo
Thu May 25, 2006 12:13 am
Forum: General Discussion
Topic: 3 prong Philips? Tampering with the tamper proof?
Replies: 12
Views: 3094

HArdware supersource McMaster-Carr has all kinds of security screws and tools to turn them. Educational browsing.
by Enzo
Mon Feb 13, 2006 8:40 pm
Forum: General Discussion
Topic: Crystal in a Socket
Replies: 10
Views: 1579

Re: Crystal in a Socket

Robert, where do they use those crystals with the 1 foot 4 inch crystal sockets?
by Enzo
Wed Dec 21, 2005 7:39 pm
Forum: General Discussion
Topic: how to know the transistor is npn or pnp
Replies: 4
Views: 1002

Re: how to know the transistor is npn or pnp

EBC is for American transistors. Japanese numbers like 2SC945 have an E C B arrangement. Frankly I see more of them than I do 2N or MPS numbers. And I have never been sure which way Euro transistors are laid out.
by Enzo
Fri Dec 16, 2005 4:41 pm
Forum: General Discussion
Topic: solarenergyandbeyond
Replies: 16
Views: 3107

Re: solarenergyandbeyond

Passive solar can be useful and cheap. Years ago, I made a 6x20 ft lean-to frame of old 2x6 boards on the south side of my Michigan home. It covered the bathroom window and the kitchen/basement door. I coverd the outside and inside with large sheets of visqueen. (clear film) On a sunny day, this gre...
by Enzo
Tue Dec 13, 2005 7:03 pm
Forum: General Discussion
Topic: what value cap is this????
Replies: 5
Views: 944

Re: what value cap is this????

Perhaps the multimeter set to capacitance...

100 nanofarad = 0.1uf

I agree with the above posters.
by Enzo
Mon Dec 12, 2005 9:19 pm
Forum: General Discussion
Topic: Price rebates
Replies: 7
Views: 1434

Re: Price rebates

I haven't been screwed on a rebate yet. I bought a new computer recently. E-machines cheapie from Best Buy. CAme with yet another printer. I have printers coming out my ears. In any case, the rebates were in six parts, some from emachines, some from Lexmark, some from Best Buy. I got the last one to...
by Enzo
Mon Dec 05, 2005 8:29 pm
Forum: General Discussion
Topic: amplify an oscillator sinve wave, without an op amp
Replies: 8
Views: 1469

Re: amplify an oscillator sinve wave, without an op amp

Sure, run it through a transistor gain stage.
by Enzo
Mon Dec 05, 2005 8:24 pm
Forum: General Discussion
Topic: Rebuilding Power Tool Battery Packs
Replies: 6
Views: 1276

Re: Rebuilding Power Tool Battery Packs

Buy the batteries with the solder tabs already on them. I priced them a while back for some daed battery pakcs. I was looking at Digikey, but never shopped further to look for prices lower. Not only can you buy them with tabs, but they will even put up groupings of them, which may or may not be help...
by Enzo
Fri Dec 02, 2005 8:51 pm
Forum: General Discussion
Topic: tip42 base current
Replies: 10
Views: 1510

Re: tip42 base current

Or use a darlington. Stick a TIP 1xx in place of the TIP42. TIP125,126,127 are choices in a 5 amp and TIP105,106,107 in an 8 amp. That assumes you want PNP. They come in NPN flavors too. Running between +12 and ground in the circuit like Philba's, you would want NPN. That is low side switching. Your...
by Enzo
Tue Nov 29, 2005 7:51 pm
Forum: General Discussion
Topic: My dad is not hard of hearing...
Replies: 9
Views: 1898

Re: My dad is not hard of hearing...

You might try testing dad with some headphones wired to something to see if he is OK with wearing the things for more than a minute. He may not like them. Good to find out before going through all the rest of it. I personally hate wearing headphones. I don't find them comfortable, and I don't like t...
by Enzo
Mon Nov 21, 2005 5:18 pm
Forum: General Discussion
Topic: Looking for a data sheet for old RCA chip
Replies: 11
Views: 1860

Re: Looking for a data sheet for old RCA chip

Looks like a 4518 equivalent, but made in the 74HCT manner.
by Enzo
Mon Nov 21, 2005 5:16 pm
Forum: General Discussion
Topic: debuging a simple distortion guitar effect
Replies: 6
Views: 1136

Re: debuging a simple distortion guitar effect

Those are on the link he provided. The pot is possibly broken in the process of construction. Also check carefully for solder bridges at the pot connections.
by Enzo
Mon Nov 21, 2005 5:09 pm
Forum: General Discussion
Topic: Mandatory basic knowledge for the nuts and the volts...
Replies: 7
Views: 1581

Re: Mandatory basic knowledge for the nuts and the volts...

I told my sister I had my house checked and they found DHMO in my basement and some in the kitchen and bathroom. She was very concerned and asked if I needed a place to stay.