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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Since there is some interest, my Geiger counter is based on a circuit described by Tom Napier in Circuit CellarNovember By the way, there are a few manufacturers of the part, and your board probably has the one from On Semiconductor. My power supply current-limited at about 1 amp. The LP data sheet does not give any insight into this situation. I could post the entire project if you think it would help sales of the ATtiny26 board.

datahseet 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 daasheet, so there is some reason to think that such a transient backflow is not damaging. Is the RS option useful? There is one error in the published circuit: 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?

National Semiconductor – datasheet pdf

Of course we had these boards made in a batch, so now each time I populate one Lp9250 have to bypass the power switch with tweezers to to clear that fuse. If I connect the 4.


The unit is currently monitoring the cosmic background adtasheet in my office 95 counts in seconds. I expect that the regulator can tolerate this but it might add some unnecessary current drain. Shop Blog Forum Support. The JTAG fuse comes set, darasheet makes some pins start up set high. Where did you get your Geiger tube? What I like about the ATtiny26 board daasheet the convenient arrangement of two ports lp950 access to power and ground at several points, coupled with the well-laid out prototyping area.

There is a small current draw increase at 5. In my version, the tube is screened so that small sources can be set right on top of the detector.

Can you try doing the regulator test again? Can you tell me what you like about it? We would probably buy a few, especially if the footprint was compact. It features an internal V power supply 2 mA total draw! Both have a thin and very delicate metalized membrane for measurement of alpha radiation. The rainbow cable leading off screen goes to the two pushbuttons and the LCD. Thanks for checking on the regulator — maybe I shorted the power supply while hooking things up.

Pololu Forum

The C program and the two buttons provide a menu-based system to set up data collection parameters and do the counting. The counter input INT0 is marked with a green arrow. I can always use diodes to switch between solar and backup supply, but I thought I could float charge the battery without such trickery.

Did you look at the datasheet from that company? Not realizing this we designed our main board which uses the pushbutton power switch with one of these connected to the OFF pin. Beta and gamma radiation are much more penetrating so the direction the pl2950 is pointing is less datasehet and is actually irrelevant for gamma radiation.


My most recent project with the ATtiny26 board is a Geiger counter. I just tried taking a regulator part not on a board and applied dqtasheet 4. Well, I connected a 4. I had to jump!

The HV generator is top right, leading to the connector for the V tube bias red arrow. If only the ATtiny26 had a bit more memory… Thanks, Jim.

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

See below for the exterior appearance. 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. Fortunately, I disconnected it quickly enough to prevent any obvious permanent damage to the regulator. I do intend to buy a few more — the sale price datasheeh very attractive, dataeheet be sure and save me a couple! I do that sort of thing all the time, and I have had no problems.

I especially like the plated through lp250, which are fantastic for prototyping if you have to remount components several times. By the way, I really like the board design. 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! The program currently occupies out of bytes of program memory. I suspect that no long term damage should result from this datasheeh, as long as one does not exceed other component ratings.