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Table of contents for the manual
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Page 1
DN1 • 1 Dr . NiCad BA TTER Y CONDITIONER/ RAPID CHARGER Ramsey Electronics Model No. DN1 Stop shelling out a fortune on bat teries ! E njoy full performance from your NiCad batteries or ba ttery packs with this sensational • Quick charges batteries for laptop computers, hand-held radios and scanners, cordless /cellular phones, camcorders, RC mo[...]
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Page 2
DN1 • 2 RA MSEY TRA NSMITT ER KITS · FM10A FM25B FM Stereo Tr ansmitters · FM100B Professional Qualit y FM Stereo Transmitter · TV6 Television Tra nsmitter · AM 1, AM 25 AM T r an s mi t te r s RAMSE Y RECEIV ER KITS · FR1 FM Broadcast Receiver · AR1 Ai r c ra f t Ba n d Re ce i ve r · SR2 Shortwave Receiver · AA 7 Active An tenna · SC1 [...]
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DN1 • 3 Dr . NiCad NiCad BA TTER Y CHARGER/CONDITIONER Ramsey Publication No. MDN1 Price $5.00 TABLE OF CONTENTS Introduction to the DN1 ................. 4 How it works ............... ................... 6 Parts list ..................... ................... 8 Schematic diagram ....................... 9 Parts Layout diagram .................. 1[...]
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Page 4
DN1 • 4 INTR ODUC TIO N With today’s e ver changing technologies, more appliances dep end on battery power to enable t heir use. W hile this gives us greater freedom, it is often at the high cost of purchasing portable ener gy, or batteries, to run our portab le electronic gismos. Consider the cost of energy from our local electric company, abo[...]
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Page 5
DN1 • 5 oxidation reduction or “redox" chemical reaction in the cell, we effectively decrease th e chemically active sur face area inside the cell. The lo w er this surface area, the shorter the ba ttery’s life. Since you don’t try to recharge convention al batteries, yo u’ve never noticed this propert y until you star ted to use rec[...]
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Page 6
DN1 • 6 We designed our kit to change quickly and easil y adapt to a variet y of cell or battery pack typ es f or anything from video camcor ders to cordless phones. You can configure it for the number of batteries in your pack, discharge and charging rate. We’ll discuss this later as we’re assembling these sections of the circuit. DN1 CIRCUI[...]
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Page 7
DN1 • 7 Since we want the voltag e appearing at the IC to be equivalent to one cell, we first must “divide” th e cell vo ltage by the number of cells in the pac k. The ladder resistors R2 -R24 form an ef fective voltage divider circuit so th at the BAT (pin 7) voltage will be about 1. 25 V per cel l. The sw itch can increase or decrease the B[...]
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Page 8
DN1 • 8 DN 1 PA RTS LI ST RESISTORS 1 270 ohm [red-v iolet-brown] (R12 ) 2 .5 ohm ½ Watt [green-black-silver] (R26, 27) 3 10 ohm [brown-black-black] (R 2, 10, 22) 2 470 ohm [yellow-violet-br own] (R3, 7) 4 1K ohm [brown-black-r ed] (R1, 5, 9, 25 ) 2 10K o hm [brown-black -orange] (R11 , 20) 1 10K ohm 1% [brown-black-b[...]
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DN1 • 9[...]
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Page 10
DN1 • 10 RAMSEY Learn-As-You-Build KIT ASSEMBLY There ar e numerou s solder connec tions on the D N1 printed circuit board . Therefore, PLEASE t a k e us seriously wh en we say that good soldering is essential to the proper operation of your Doctor Nicad! • Use a 25-watt soldering pencil with a clean, sharp tip. • Use only rosin-core solder i[...]
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Page 11
DN1 • 11 DN1 PARTS FI NDER DIAGRAM[...]
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Page 12
DN1 • 12 1. Identify and install DPDT switch S2. Be sure to push the switches flat to the circuit board. Solder all six connections. 2. Install the other DPD T toggle power switch S3. Once again , be sure to push the component flush to the circuit board before soldering. We’ll start our “learn-as-you build” instructions with the pow[...]
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Page 13
DN1 • 13 11. Install R1, 1K ohm [brow n-black-red]. 11. Install Q1, the power FET transistor [marked 7035]. Fo rm the leads as shown prior to installation. Bolt the regulator to the circuit board. 12. Install L1, the large axial leaded w ire wound inductor. 13. Install D1, 1N4937 fast recovery diode. Observe the correct polarity ![...]
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Page 14
DN1 • 14 23. Select two of the 1uF e lectrolytic capacitors and solder the ground leads together.Install them as C3. Bend the ground leads away from U1. 24. Install C1, the remaining 1uF cap acitor. The positive side should be faci ng R5 . 25. Install the Benchmark BQ200 3 IC. Notice that one end of the chip is marked with a do t, not[...]
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Page 15
DN1 • 15 present, giving us an accurate representation of one cell contained in the pack. 33. Install R21, 47K ohm [yellow-violet-ora nge]. 34. Install DIP switch S1 (D)ual (I)nline (P)ackage. Make sure that the switchable contacts face toward the ou tside of the circuit board, allow ing for easy chan ging of number of cells to charge. ?[...]
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Page 16
DN1 • 16 CONGRATULATIONS You have just co mpleted you r DN1 NiCa d batte ry conditione r unit. Tak e a well deserved break no w. Give your eyes a rest. W hen you return, be sure to check over your work on the entire circuit board. Energiz ing the circuit boa rd with solde r “bridges” or misplaced components can damage your kit. Don’t throw [...]
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Page 17
DN1 • 17 Fill in the chart with the ra tings imprinted on your ba tteries. This shoul d help you to determine the proper jumper settings DN1 FINAL A SSEMBL Y INST RUCTIONS Use scrap resistor leads to form the proper “jumper” w ires to configure your conditioner. Use the parts diagram to identify the proper holes for the ju mper wires CHARGING[...]
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DN1 • 18 SETTING UP THE SWITCHES You’ll need to configure the ro w of DIP s w itches for y our battery pack now. Since the minimum number of cells is at least one, the conditioner is already set up for a single battery to begin w ith. Switch No. 10 is reserved for the discha rging current setup. W hen it is closed the Doctor is in low current d[...]
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Page 19
DN1 • 19 indicator. By changing the ON / OFF times this LED becomes a charging status indic ator! Us e the following chart f or an indica tion of what the doctor is telling you. POWER SUPPLY CONSIDERATIONS The power supply used for the Dr. NiCad can very greatly depen ding on ho w you set up your char ger to work. While y ou m ay be able to “ge[...]
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Page 20
DN1 • 20 begin the Fast Charging mode. The Benchmark IC will constantly moni tor the pack and tu rn off the fast charge w hen the c ells are charged just to f ull capacity. Once this is accomplished, it will periodic ally “top off” the cells wi th a high current burst, and allow a slig ht trick le charge to f low . Unfortunately , about the o[...]
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Page 21
DN1 • 21 handled by the doctor, but if you have seve ral pack s, be sure to rotate them (or maybe buy a few more Dr. NiCad Chargers). BATTERY REPAIR ?? !! Many times we have older ba tteries or packs that don’t seem to hold a charge at all, but they were so expe nsive that we couldn’t bear to toss them in the trash. W ell, your fruga lity (so[...]
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Page 22
DN1 • 22 Use a methodical, logica l troubleshooting technique. Most problems can b e solved using common sense. A volt-ohm meter and a clear head a re usually all that are needed to correct any problem. Please un derstand that it is nearly impossible to “troubleshoot” by phone; any s pecific questions should be documented and sent to us by ma[...]
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Page 23
DN1 • 23 The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. M ost problems can be solved without contacting the factory. Notice that thi s is not a "fine p rint" w arr a nty. We want y ou to unders tand your rights and ours too ! All Ramsey kits will w ork if assembled pro perly. The very fact tha[...]
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Page 24
DN1 • 24 DN1 Dr. NiCad BATTERY CONDITIONER Quick Referenc e Page Guide Introduction to the DN1 ...... .................. 4 How it works ............. ....................... ..... 6 Parts list ............... ..................... ........... 8 Schematic diagram ..... ........................ . 9 Parts Layout diagram ....................... .. 11[...]