| 1992 Oct QST
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An Active Audio filter You Can Build
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Switched capacitor filter using the MF-8. Vary the bandwidth with a front panel switch. Sharp
cutoff.
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| 1995 ARRL Handbook
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A Tunable Switched Capacitor Audio Filter
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Same as above
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1993 Feb QEX
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Making Meters with Chips
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Accurate meters are easily made with readily available ICs.
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| 1993 Nov QEX
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An 8085 Based Computer System
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Programs Eproms,87C51, 87C52, Dallas 87C520.. Expandable with edge contact cards if you add the software you can do most anything.
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| 1993 Dec QEX
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A Programmer for 87C51 Microcontrollers
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Use with above to program 87C51 and 87C52 and Dallas 87C520
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| 1994 Jan QST
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Uncle Albert's Unique Keyer
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An Iambic keyer that displays the CW you send on an LCD screen
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| 1996 ARRL Handbook
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Improved Uncle Albert's Keyer
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An Iambic keyer that displays the CW you send on an LCD screen it also displays incoming CW and has a variety of tutor modes.
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| 1996 June QST
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SMALL- A Surface Mount Amplifier that's Little and Loud
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 A surface mount audio amp based on the LM4861. Much better sound, more power, more efficient that LM386 and similar amps.
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| 1997 July QST
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My All Purpose Voltage Booster
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 Switching Mode voltage booster power a 12 volt QRP rig from 4 Nicads or a 19 volt laptop from a 12 volt battery.
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| 1995 June 73 Amateur Radio Today
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N4UAU Super CW Station
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 Displays
CW both what you send and what is coming in ,sends random code for practice, 3 memories, built in clock and alarm.
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| 1996 March 73 Amateur Radio Today
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The Tiny Tic-Tac Tester
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 An easy to build,inexpensive voltmeter. Needs no battery to operate. Read in the dark. Use it to trigger an alarm. Very accurate in expanded scale mode. Ideal first project - just one IC, 10 LEDS, a few resistors.
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| 1997 Jan 73 Amateur Radio Today
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An Enhanced Automatic Voltage Controller
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Hi or Lo Voltage circuit breaker. Solid state parts make it very fast acting.
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| 1997 March73 Amateur Radio Today
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Are You ready to Recharge
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Rechargeable alkaline batteries like RENEWALS need a special charging circuit.This does it. Note the non informative title was choosen by the editor not me.
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| 1997 June 73 Amateur Radio Today
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The Nicad Health Maintenance System
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A circuit for charging and discharging to condition Nicad batteries. Deep discharging (to a controlled voltage) is useful from time to time to be able to obtain the maximum capacity from Nicads. It reduces the so called Memory Effect.
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| 1998 March 73 Amateur Radio Today
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Truckez Vous Mon Boat
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About my trip down St Lawrence; the problems I had and how ham radio saved the day especially because my French was limited at best as you can see from the title which also was not my title but choosen by the editor.
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| 1998 May 73 Amateur Radio Today
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Penny Pincher's Digital Ammeter
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To monitor current use on my sailboat I built this inexpensive but accurate digital ammeter. Using a wire as low value resistor the digital readout could display currents from 0.1amp up to 100.0 amps. I could tell how many lights were on and if some had higher wattage bulbs than others and I could also monitor the charging current of my high output alternator.
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| 1998 June 73 Amateur Radio Today
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A Pentium Style Positive and Negative Power Supply
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The LM2825 and LM2662 are two state of the art IC's to provide an efficient source of 5 and minus 5 volts.
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| 1998 July 73 Amateur Radio Today
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Mega-Mini Micropower Timeout Switch
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State of the art technology allows an ultra small shut down timer to fit inside
the battery compartment of a DVM. Extends the life of your expensive 9 volt DWM battery.The comparator is 'really cool" very high input resistance, almost no current demand. This is one of my favorite projects just because the technology involved is so advanced.
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| 1999 January QST
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Getting More Voltage Out of a Regulator IC
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You need 8 or 9 volts for a project buy all you can find is a 5 volt regulator. This handy circuit shows how you can get that voltage from the 5 volt regulator.
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| 1999 April QST
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SMT-You Can do it Part 1
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 How and why Amateurs should learn to work with Surface Mount IC's. Some non SM starters plus Project 1. If you haven't tried building with SM IC's you are missing a lot of possible projects! The picture shows a project I made with regular through hole parts but I use my SM board making technique, described in the article to make the board. You can read the article at the ARRL web site.
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| 1999 May QST
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SMT-You Can do it Part 2
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 A very small voltage inverter that works better than much bigger non SM inverters commonly available.
You can read about it at the ARRL web site.
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| 1999 June QST
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SMT-You Can do it Part 3
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 Low voltage
battery protection switch will keep you battery from running down and getting ruined if you happen to leave something turned on. The circuit is small but can handle up to 10 amps or more if you select a different Mosfet. Read about it at the ARRL web site.
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| 1999 July QST
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SMT-You Can do it Part 4
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The Hourglass Timer - A versatile timer that fits in a 35 mm film can and runs off a single lithium coin battery. It can time events from seconds to hours. Read
about it at the ARRL web site.
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| 2000 Jul/Aug, Sep/Oct, Nov/Dec QEX
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A Simple UHF Reomote- Control System (3 parts)
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Some UHF projects based on garage door opener modules that operate in the Ham
band. Use them for a remote CW keyer, listen remotely to SSB on your HF. These modules make it easy to work at UFH frequency.
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| 2001 Feb QST
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The World's Smallest Code Practice Oscillator
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 Surface Mount Code Practice Oscillator only 1 cm by 1cm in size. It can run on 3 volts up to 20 volts. State of the art Mosfet allows maximum power output. 3 watts with 5 volts. A good way to practice your CW.
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| 2001 Oct QST
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Uncle Albert's Touch Pad Keyer
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 Why pay $150 or more for a set of paddles and keyer when you can build this one for much less? Small, inexpensive yet it will do all that the expensive setups do and more. It runs off a SINGLE lithium battery and is only 1.8” high and 1.5” wide
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