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From the Forums: A Couple Time-tastic Clock Designs by chris101
— by nicknormal
Filed under: arduino, clocks & watches — 
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Design Low-Pass, High-Pass, and Band-Pass Filters in Browser in Minutes | via @adi_news
— by nicknormal
Filed under: components & parts — 
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Homemade Exponential Voltage-Controlled Oscillator Uses Multiple LM358 Dual Op-Amps #MusicMonday
— by nicknormal
Filed under: music — 
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Electrocardiography for Cheap: DIY ECG Uses One LM741 Op-Amp, Five Resistors, and ‘Penny Electrodes’
— by nicknormal
Filed under: components & parts, projects — 
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NEW PRODUCT – Evil Mad Scientist Labs XL741 Discrete Op-Amp Kit
— by alon shapiro
Filed under: kits, projects — 
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