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Astable flip flop from Diptrace manual Low power gated crystal oscillator
This is the best place to start, because the manual tells you step by step how to make it. It is a simple discrete flip flop. use it as a low frequency signal source. # flip-flop Simple circuit uses CD4081. it has a 32.768khz crystal, that is gated by any length square wave pulse. great for clock type circuits  etc   # OSC1001
download  schematic, board files   SS download  schematic, board files    SS
   
LM324 LED audio level meter Discrete RF preamp for AM broadcast band
This circuit uses two quad op-amps to form an eight LED audio level meter  # VUmeter Uses 3 transistors. needs no coils, perfect for pulling in those far away stations  # RFamp1001
download  schematic,  board files, text  DS download  schematic,  board files, text  SS
 
Bounce less Push Button Module Digital Lock
zero current draw in idle state, bounce less push button 100uS pulse  # DBS1001 Uses 0 > 9 keypad programmable 4 digit code.  # DL1001
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Single Stage Counter Module Single/dual Siren
 Can be combined for larger stages # SSC1001 Just like police/fire etc # SIREN-1001
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Display Board single CC Module Display Board single CA Module
Can be combined for larger stages # DBScc1001 Can be combined for larger stages # DBSca1001
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4 Stage Frequency Counter Audio Stereo Pre-amp
For audio up 10Kz or other counting # C4S1001 Super Spec's @ 2 mA 1 IC only
download  schematic,  board files, text  DS download  schematic,  board files, text  SS
 
Self-powered Sine to Square wave Converter Bi-directional Photo Counter

Converts sine to square waves without a power-source  Can be used in a probe case or as part of a larger project.

Counts the number of people entering the room and shuts lights off only when room is empty.
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4 Watt FM Radio Transmitter Bot Robot by Seth Koster
Very detailed instructions at FM-KIT SS download  schematic,  board files, DS
download Schematic, board files. If you need the hard to get aperture ferrites VK200 we have them pre-wound 4 for $4.00 ship worldwide $3.00. ship extra lots 50 cents per extra lot.
   Based on original research done by Mark Tilden of  Los Alamos National Laboratories  who created and owns the BEAM patents, information found on Harold R. Ilano's webpage and on the Costa Rica BEAM webpage. instructions
   
VO Fuel Controller by Seth Koster Simple Tracking Dual Power Supply
Detailed Instructions at VOfuel Uses LM317T and LM337 and LM301
download  schematic,  board files, SS download  schematic,  board files, SS
 
Simple Power Supply LM317 Auto Fan Control for Power Supply etc
Detailed Instructions click here Detailed Instructions click here Turns on fans in power supply or home as needed.
download  schematic,  board files, SS download  schematic,  board files, SS
   
Solid State Relay Module Audio Amplifier LM386 Module
Detailed Instructions click here Use as stand alone or as part  of larger circuit Use as stand alone or as part of larger circuit no instructions   needed.
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Fluid Level Sensor Module Logic Probe with Pulse
Detailed Instructions click here Use as stand alone or as part  of larger circuit Detailed Instructions click here uses through hole components
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Heat Sensor Module  
Detailed Instructions click here Use as stand alone or as part  of larger circuit 10K Thermistors 25 for $5 plus ship $3 world wide extra lots ship 50 cents extra per lot
 
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Function Generator Intersil/Harris 8038 Police Siren
Frequency Range 10 to 20k for audio work. Detailed Instructions click here  Lab Grade Check with your local police before installing in a car. her are Full instructions click here
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SCA Adaptor for FM tuners Model Rocker Launch Control
Listen to commercial free music on 88 to 108 FM radio.      Full instructions click here Full construction details click here
download  schematic,  board files, SS download  schematic,  board files, SS
   
Motor Controller for DC 12 Volt Low frequency crystal
Use it to control  motors for robotics etc Below 500khz crystals are tricky. use this circuit. Full instructions click here
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All libraries and data sheets are presented here on a "as is" basis and Technology Systems is not liable for accuracy of material. They are made for the hobbyist to use on a inkjet printer using clear plastic sheets from stationary store as over lay for photo etching or the transfer paper type. If making a lot make a prototype first  to check on the accuracy of the libraries and pc board layouts.

 
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