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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Well, I connected a 4. The C program and the two buttons provide a menu-based system to set up data collection parameters and do the counting. Llp2950 I connect the 4. I especially like the plated through holes, which are fantastic for prototyping if you have to remount components several times.

LP Datasheet UTC pdf data sheet FREE from

I do intend to buy a few more — the sale price is very attractive, so be sure and save me a couple! The rainbow cable leading off screen goes to the two pushbuttons and the LCD.

I do that sort of thing all the time, and I have had no problems. Fortunately, I disconnected it quickly enough to prevent any obvious permanent damage dataheet the regulator. The HV generator is top right, leading to the connector for the V tube bias red arrow. 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 to think that such a transient backflow is not damaging.

Is the RS option useful? My power supply current-limited at about 1 amp. I suspect that no long term damage should result from this misuse, as long as one does not exceed other lo2950 ratings. The counter input INT0 is marked with a green arrow. Where did you get your Geiger tube? The unit is currently monitoring the cosmic background radiation in my office 95 counts in seconds.


The LP data sheet does not give any insight into this situation.

Pololu Forum

Since there is some interest, my Geiger counter is based on a circuit described by Tom Napier in Circuit CellarNovember By the way, I really like the board design. See below for the exterior appearance.

I just tried taking a regulator part not on a board and applied from 4. Not realizing this we designed our main board which uses the pushbutton power switch with one of these connected to the OFF pin. datassheet

There is one error in the published circuit: Can you try doing the regulator test again? If only the ATtiny26 had a bit more memory… Thanks, Jim. There is a small current draw increase at 5.

National Semiconductor

Did you look at the datasheet from that company? We would probably buy a few, especially if the footprint was compact. The JTAG fuse comes set, which makes some pins start up set high. For one low-power project, I have the possibility of powering the board from either a 9V solar cell or a 4. I expect that the regulator can tolerate this but it might add some unnecessary current drain. My most recent project with the ATtiny26 board is a Geiger counter. Both have a thin and very delicate metalized membrane for measurement of alpha radiation.

By the way, there are a few manufacturers of the part, and your board probably has the one from On Semiconductor. I had to jump! I can always use diodes to switch between solar and backup supply, but I thought I could float charge the battery without such trickery. 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.


It features an internal V power supply 2 mA total draw! Beta and gamma radiation are much datasheey penetrating so the direction the tube is pointing is less important and is actually irrelevant for gamma radiation.

The program currently occupies out of bytes of program memory. 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 datasheet to 6-pin ISP connectors. 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!

Can you tell me what you like about it? 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? Shop Blog Forum Support. I could post the entire project if you think it would help sales of the ATtiny26 board.