Instruction/ maintenance manual of the product 2 1/2 Watt Super Sleuth Audio Amplifier Ramsey Electronics
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• Audio b ooster amps f or r adios, Walk mans etc. • Replacement amplifiers • High sensi tivi ty long dis tance l iste ning amplif ier f or ‘B ig Ear s upe r sleuth ’ sno opin g! • Mini PA.
INTROD UCTI ON TO THE BN9 The BN9 is a high gain miniature am plifier w ith all sorts of possible a pplications, limited only by your imagination. Its s mall size and econo mical pric e make it a useful addition to many projec ts and re- pairs. The BN9 has an amplificat ion gain fa ctor of 3000 with as muc h as 2 1/2 w atts of audio pow er output.
BN9 PARTS LIST ❒ 2 .01µF ceram ic disk capacitor s (C1, C2 ) ❒ 3 4.7µF or 10µF electrol yt ic capa citors (C 3,C4,C 6) ❒ 1 100µF to 500µF elect rolytic capacitor (C5) ❒ 1 220K ohm resisto.
BN9 PC BOARD ASSEM BLY As you can see this is a fairly simple and straightforward project, but be careful ! Don’t rush and improperly mount a part or leave long lead leng ths on components. As all good technici ans and experimenters know, part s must be mounted f lush to th e P C board.
ASSEMBLY OF THE BN9 ❒ 1. Orient the circuit board as shown in the Parts Layout Diagram. ❒ 2. Install U1, th e LM-3 80 IC into the P C boa rd, making sure that all 14 pins are in their proper holes. Also note in which direc tion the not ch is or iented in the Parts Layout Diagram.
The following electrolytic c apacitors are polarize d and must be insert ed with proper orientat ion to the polarity markings . Usually the capac itors are marked wi th a side stripe to indicate the ne gative (-) pin or rarely a plus symbol to indi cate the plus side.
INIT IA L T ESTS: ❒ 1. Connect up 8 t o 15 volts of DC power. For s i mplicity use a red wire for posit ive (+) and a black wire for negative (-). Wait! check pola rity before sw itching on the supply. ❒ 2. Connect any speaker ranging fr om an impedance of 3 ohms to 45 ohms.
MICROPHONE AND A UDIO INPUT CONSIDERATION You may choose almost any transducer to convert soun d int o an electrical signal fo r your BN9. Some of the transduc ers are as follows; ceramic, crystal, dy.
Problem: Output drops out and then bu ilds up again each time volume control is advanced. Solution: You are running w ith too muc h input power. Ch ange circuit for lower gain operation or re- duce input level. Problem: Very strong AC hum. Solution: Input may not be shielded or c onnected proper ly.
Solution: Mo torboati ng is a sound like the “putt-put t-putt” of a two cycle motor boat . While it may be a novel idea for a simple kit, it’s not exactly what we have in mind here. This is usually noticed at higher audio levels due to the power drawn from the power source.
BN9 A PPLICA T ION IDEA S: 1. High s ensitiv ity listenin g dev ice Compon ents required: • Small microphone such as RAMSEY MC1, mini-electret mike. • 5K to 100K potent iometer for volume control.
2. Intercom Com ponents re quired: • DPDT s witch (m omentary m ost practi cal) • Two 8 ohm speakers • Your choice of enc losures IN OU T Low gai n B N -9 Re mo t e Local 3.
IN OU T H o rn S p e a k e r Hi g h Ga i n B N- 9 4. A uxiliary amplifier for mini re ceiv ers Compon ents required : • 8 Ohm sp eaker • 5K to 100 K Po tentio meter • 10 ohm resistor To Rece iv .
P r obe 200V IN OU T 5. Signal Tracer T est Probe Components req uired: • .01uF C eramic ca pacito r rated a t at le ast 200V for tu be ci rcuits • 5K to 100K Potentiom eter • Shielded test prob.
The Ra msey Kit Wa rranty Please read c arefull y BEFOR E callin g or wr iting in a bout your kit. Mos t proble ms can be solved without c ontacting th e fac tory. Notic e that t his is no t a "fin e print" w a rrant y . We want y ou to underst and y our rights a nd ours too! Al l Ra msey kits will w ork if assembled properly .
Published by Ra mse y Electronics, Inc. Copyright 1994 All rights reserved. Ramsey Electronics, Inc. 590 Fishers Station Drive Victo r, NY 14564 Phone (585) 924-4560 Fax (585) 92 4-4555 www.
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If you already are a holder of Ramsey Electronics 2 1/2 Watt Super Sleuth Audio Amplifier, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Ramsey Electronics 2 1/2 Watt Super Sleuth Audio Amplifier.
However, one of the most important roles played by the user manual is to help in solving problems with Ramsey Electronics 2 1/2 Watt Super Sleuth Audio Amplifier. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Ramsey Electronics 2 1/2 Watt Super Sleuth Audio Amplifier along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
