T&L Publications

I would like to get a National Semiconductor 4000 Series CMOS databook. Anyone have one?

Anyone have a CA3130 op-amp or two they would be willing to sell me? I realize this is an old one, now obsolete... Thanks!

What is the best source for small (epoxy) through-hole type prototyping/small project circuit boards? I'm looking for maybe something with a ground trace, and multiple holes per pad, with a standard I.C. component hole size and spacing. A board and plastic box combo would be a bonus. Thanks.

I'd like to find a source (other than, say, EBAY) for a couple of LM2941CT low dropout voltage regulator chips, that will send them through the mail at actual postage costs.

Data sheet would be great, mnboy.

I am looking for sample circuits and application data for the EXAR XR-2242 long-range timer integrated circuit.

I'd like to get us off on another tangent. This applies especially to mechanical relays switching 120 VAC loads. What about approaches to reducing the electrical noise (interference) generated when the relay is swithched on and off? I'm talking about the type of trash you see and hear on TV's and ra...

I'm interested in a circuit (chip) that will turn a relay on at (pseudo-)random intervals, and keep it on for (pseudo-)random intervals. Both the maximum time between turn-ons and the maximum duration of time on should be independently adustable by the user. Thanks!

Does anyone have the schematic for the Velleman Kit #K7300 Automatic Battery Charger? Thanks!

That's probably the best shot at it. Like I said, I had been thinking of a single-chip solution along the lines of an EXAR, but I guess they're pretty much passe now. Thanks!

The triger would be a user activated momentary pushbutton switch. (Or a positive pulse to near the +12VDC supply rail at the trigger input.) The "off" state would be close to supply common, the "on" state would be close to 12v at the timer output. Maximum supply current drain wou...

I need a timer circuit building block to incorporate into a device I am building. It needs to provide a delay of at least 15 minutes, draw as little current as possible, especially when "off", operate from 12v DC (with delay duration largely independent of small supply flutuations), and ha...

I am thinking of constructing a small windmill (4 to 5 feet high), and covering the blades with solar cells, to generate electricity from both wind and sun and charge some batteries. Has anyone seen a project like this published, or have any ideas on the subject? Thanks!

What about using a Darlington bipolar transistor?

Anyone have a circuit trainer -- solderless breadboard, variable regulated DC power supply, digital VOM -- they would like to unload?
Thanks!