General Description. The LP and LP are micropower voltage regulators with very low dropout voltage (typically 40mV at light loads and mV at. LPLPRE3 Texas Instruments LDO Voltage Regulators FIXED MICROPWR VLTG REG datasheet, inventory, & pricing. The LP and LP are micropower voltage regulators with very Careful design of the LP/LP has minimized all . See MIL/AERO Datasheet.

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National Semiconductor

I could post the entire project if you think it would help sales of the ATtiny26 board I do intend to buy a few more — the sale price is very attractive, so be sure and save me a couple!

I could post the entire project if you think it would help sales of the ATtiny26 board. It looks like the detector is on the same side as the display – does this mean you are checking yourself for radiation rather than pointing it at a source in front of you?

Not realizing this we designed our main board which uses the pushbutton power switch with one of these connected to datasheey OFF pin. Beta and gamma radiation are much more penetrating so the direction the tube is pointing is less important and is actually irrelevant for gamma radiation. The rainbow cable leading off screen goes to the two pushbuttons and the LCD.

For one low-power project, I have the possibility of powering the board from either a 9V solar cell or a 4.

Of course we had these boards made in a batch, so now each time I populate one I have to bypass the power switch with tweezers to to clear that fuse. Fortunately, I disconnected it quickly enough to prevent any obvious permanent damage to the regulator. By the way, there are a few manufacturers of the part, and your board probably has the one from On Semiconductor.

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I do intend to buy a few more — the sale price is very attractive, so be sure and save me a couple! I l;2950 to jump!

I especially like the plated through holes, which are fantastic for prototyping if you have to remount components several times. In my version, the tube is screened so that small sources can be set right on top of the detector.

What puzzles me is that the regulator encounters this situation every time the external source is switched off and there are capacitors in the circuit that must be discharged, so there is some reason datasheft think that such a transient backflow is not damaging.

See below for the exterior appearance.

We would probably buy a few, especially if the footprint was compact. There is one error in the published circuit: If I connect the 4. What I like about the ATtiny26 board is the convenient arrangement of two ports with access to power datashet ground at several points, coupled with the well-laid out prototyping area.

Both have a thin and very delicate metalized membrane for measurement of alpha radiation. Thanks for checking on the regulator — maybe I shorted the power supply while hooking things up.

I suspect that dataasheet long term damage should result from this misuse, as long as one does not exceed other component ratings. Can you try doing the regulator test again? The JTAG fuse comes set, which makes some pins start up set high.

LP Datasheet Alpha Semiconductor pdf data sheet FREE from

The board is shown below. Shop Blog Forum Support. The program llp2950 occupies out of bytes of program memory. There is a small current draw increase at 5. If only the ATtiny26 had a bit more memory… Thanks, Jim. Is the RS option useful? Well, I connected a 4.

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I do that sort of thing all the time, and I have had no problems. My most recent project with lp29500 ATtiny26 board is a Geiger counter. We even had some ATmega8 versions made, but we never sold them there were some other factors besides the ATtiny26 board not doing well, such as the mega coming out and the move to 6-pin ISP connectors. Where did you get your Geiger tube? The C program datashedt the two buttons provide a menu-based system to set up data collection parameters and do the counting.

The unit is currently monitoring the cosmic background radiation in my office 95 counts in seconds. Since there is some interest, my Geiger counter is based on a circuit described by Tom Napier in Circuit CellarNovember It features datasheeet internal V power supply 2 mA total draw! I just tried taking a regulator part not on a board and applied from 4. I can always use diodes to switch between solar and backup supply, but I thought I could float charge the battery without such trickery.

I expect that the regulator can tolerate this but it might add some unnecessary current drain. The LP data sheet does not give any insight into this datzsheet. Can you tell me what you like about it?

ATtiny26 board / LP regulator – Electronics – Pololu Forum

The counter input INT0 is marked with a green arrow. The HV generator is top right, leading to the connector for the V tube bias red arrow.

Did you look at the datasheet from that company? By the way, I really like the datasbeet design. My power supply current-limited at about 1 amp.