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LABC1

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LEAD ACID BATTERY
CHARGER KIT

Ramsey Electronics Model No. LABC1

An educational kit that will come in handy around the shop and
garage. Build your own charger instead of shelling out big bucks
for a “store bought” unit. You might learn more than you ever
wanted to know about batteries and battery charging. Amaze
your friends with your new found knowledge. Wait . . .is that
Regis on the phone?

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No more fried gel cells!

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Extends the life of your 12 volt lead acid batteries.

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Automatic ambient temperature compensation.

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Automatically adjusts charge voltage depending on battery status.

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Bright front panel charge indicator.

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Saves spending money on costly replacement batteries; pays for
itself in no time!

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Add our matching case and knob set for a professional appearance.

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Содержание LABC1

Страница 1: ...t batteries and battery charging Amaze your friends with your new found knowledge Wait is that Regis on the phone No more fried gel cells Extends the life of your 12 volt lead acid batteries Automatic ambient temperature compensation Automatically adjusts charge voltage depending on battery status Bright front panel charge indicator Saves spending money on costly replacement batteries pays for its...

Страница 2: ... Tri Field Meter RAMSEY AMATEUR RADIO KITS DDF1 Doppler Direction Finder HR Series HF All Mode Receivers QRP Series HF CW Transmitters CW7 CW Keyer CPO3 Code Practice Oscillator QRP Power Amplifiers RAMSEY MINI KITS Many other kits are available for hobby school Scouts and just plain FUN New kits are always under development Write or call for our free Ramsey catalog LABC1 KIT INSTRUCTION MANUAL Ra...

Страница 3: ...arts Layout Diagram 9 Parts List 10 Kit Assembly 12 Custom Case Assembly 15 Adjusting your LABC1 17 Safety Considerations 18 Troubleshooting Guide 19 Warranty 23 KIT ASSEMBLY AND INSTRUCTION MANUAL FOR RAMSEY ELECTRONICS INC 590 Fishers Station Drive Victor New York 14564 Phone 585 924 4560 Fax 585 924 4555 www ramseykits com TABLE OF CONTENTS ...

Страница 4: ...e positive electrode plates are formed from lead dioxide PbO2 while the negative electrodes are made of sponge metallic lead Pb The porous nature of the lead plates allows the electrolyte a dilute mixture of 35 sulfuric acid and 65 water to efficiently contact the maximum surface area and obtain the most charge carriers The electrolyte solution provides the sulfate ions formed during the discharge...

Страница 5: ...yte reduces its overall weight as the sulfur is removed from the solution thus reducing the specific gravity measurement Take a look at Table 1 Great care should be taken to avoid discharging a battery beyond the 75 SOC point Once the specific gravity drops below the 1 210 level excessive sulfate deposits form on the electrode plates This process is called sulfation and leads to the hardening of t...

Страница 6: ...tinual high voltage charging will decrease the overall life of the battery Let s take a closer look at the LABC1 schematic and see what s happening The power supply inlet for the LABC1 is J1 The input voltage is immediately presented to a full wave bridge rectifier consisting of diodes D1 to D4 and then filtered by C1 to reduce the voltage ripple Using a bridge configuration on the voltage input a...

Страница 7: ...reference feedback circuit of VR1 causing its output voltage drop back to 13 4V The Charged LED D15 is turned on when the Base Emitter junction of Q1 is thus forward biased indicating that the battery is charged and is being topped off by the Float mode operation Now that the battery is charged the ambient temperature compensation circuit comes into play The effects of this circuit formed by R2 R3...

Страница 8: ...LABC1 8 ...

Страница 9: ...LABC1 9 LABC1 PARTS LAYOUT DIAGRAM ...

Страница 10: ... R2 Semiconductors and Integrated Circuits 11 1N4148 diodes small glass diode D5 6 7 8 9 10 11 12 13 14 17 4 1N4002 or 1N4004 diodes black with white band D1 2 3 4 1 221334 transistor three leads TO 92 package marked 221334 Q1 2 JUMBO red LEDs D15 16 1 LM317 3 terminal adjustable regulator VR1 1 LM334 IC three leads TO 92 package marked LM334 U1 Miscellaneous Components 1 2 1mm power jack J1 1 DPD...

Страница 11: ...losophy This entails describing the circuit that you are building instead of just blindly installing components We hope that this will not only make assembly of our kits easier but help you to understand the circuit you re constructing For each part our word Install always means these steps 1 Pick the correct component with the proper value to start with 2 Insert it into the correct PC board locat...

Страница 12: ...r progress Check all received parts against the parts list The parts list describes the various markings that may be found on the kit parts Carefully sort the parts into small piles an empty egg tray does nicely for this purpose to aid in finding the correct part at the required time 1 Install DPDT PC mount pushbutton switch S1 Be sure it is seated properly before soldering all 6 pins 2 Install J1...

Страница 13: ... are bent and through their PC board holes take the screw and nut and attach the LM317 and the heatsink to the board It is easiest to put the screw through the top of the components and tighten the nut on the bottom of the board Once the screw is holding everything in place solder the three leads of the LM317 7 Install J2 the 2 screw terminal jack The openings should face the rear of the PC board ...

Страница 14: ...PNP transistor This transistor appears to have two flat sides one with writing on it and a larger flat side without writing The pin orientation of Q1 the 2N3906 221334 transistor is incorrect on your LABC1 circuit board The larger flat side with no writing is the one pictured on the silkscreen orient the part using this as the correct flat side with the flat side no writing facing the front of the...

Страница 15: ...ou ll see that the LEDs have a flat side and so does the PC board silkscreen Orient the flat sides correctly and slide the diodes into their mounting holes One lead is shorter than the other just like the electrolytic capacitors we installed earlier This indicates the cathode or negative lead of the LED and should correspond to the hole closest to the flat side Get them both lined up so that they ...

Страница 16: ...s 1 Lay the front and rear plastic plates over their corresponding labels to verify which sticker goes with which panel You ll want to work with one panel at a time to avoid possible mix ups 2 Remove the backing material from one of the stickers and line it up properly on its pre punched panel Make sure that they are aligned correctly before allowing them to touch the plastic plates They stick the...

Страница 17: ... the probes Red Black across the output of J2 Trim the pot R2 to get a reading of 13 4 VDC 0 01 VDC at a room temperature of 25 C 77 F with no battery attached If your room temperature is above or below 25 C you will need to account for the difference by offsetting the alignment voltage by 22mV 10 x 2 2mV C for each of the sensor diodes for every 1 C of difference See Table 2 for examples If you d...

Страница 18: ... it The battery s sulfuric acid can cause bodily harm to you and the environment around you should an explosion occur If you should hear excessive bubbling kind of like a bowl of Rice Krispies with milk coming from the battery cease charging immediately and investigate the situation Your safety is your responsibility and the end use of your LABC1 or any other charger is up to you to use responsibl...

Страница 19: ... mind that cell gassing normally begins at 14 4V and higher at 25 C so doing this is risky Great care should be taken to avoid possible gas build up inside the battery See the Safety Considerations section before operating your LABC1 3 Another point to cover is the type of hook up wire used to connect your LABC1 to your battery The wire provided with your kit works well for hobbyist type batteries...

Страница 20: ...ttom side of the circuit board all solder connections Hints Erratic or unstable operation is generally caused by faulty solder joints or cable connections Replacement components may be ordered directly from Ramsey Electronics Inc but records show that failure rates for these parts are extremely low Please understand that it is nearly impossible to troubleshoot by phone Any specific questions shoul...

Страница 21: ...mers we value your opinions comments and additions that you would like to see in future publications Please submit comments or ideas to Ramsey Electronics Inc Attn Hobby Kit Department 590 Fishers Station Drive Victor NY 14564 Please feel free to visit our Website at www ramseyelectronics com and offer your observations to other kit enthusiasts as well And once again thanks from the folks at Ramse...

Страница 22: ...LABC1 22 This page intentionally left blank Don t you hate it when people do this Why don t they just admit that they ran out of things to say ...

Страница 23: ...ch be assured that the 1K ohm resistors are actually the missing 10 K parts Hum m m I guess the red band really does look orange Ramsey Electronics project kits are packed with pride in the USA If you believe we packed an incorrect part or omitted a part clearly indicated in your assembly manual as supplied with the basic kit by Ramsey please write or call us with information on the part you need ...

Страница 24: ...amsey RTS05 Small Diagonal Cutters Ramsey RTS04 OR Complete Soldering Tool Set RS64 2801 ADDITIONAL SUGGESTED ITEMS Optivisor Magnifier Headband Ramsey OPMAG Holder for PC Board Parts Ramsey RTS13 Desoldering Braid Ramsey RTS08 LABC1 LEAD ACID BATTERY CHARGER KIT Quick Reference Page Guide Quick Battery Theory 4 Circuit description 6 Schematic diagram 8 Parts layout Diagram 9 Parts list 10 Kit Ass...

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