Simple Crystal Radio
This is a simple crystal radio that I built to help me understand more about Dr. Stiffler’s SEC Exciter. This radio is powered only by the airborne signal from a strong radio station. It…
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Two JT Circuits In Parallel Test Rig
This is a test rig to allow 2 HV JT circuits to be placed in parallel. I can operate 1 JT circuit from 1 AA battery or, tie two JT circuits together from the…
Internal Bulb Circuits
A quick test of an idea, thought about for some time but not implemented. It struck me that a lot of circuits are around to light household bulbs with batteries, but the circuits themselves…
Crystal oscillator radio transmitter
This is a simple AM radio transmitter that uses a 1MHz crystal oscillator module and just a few other parts. You can find info on this at SciToys.com. My first attempt to build this…
AM Radio with wireless Loop Antenna
This shows a wireless non- powered “Loop Antenna” that enhances the reception of my homemade AM radio. This one is my own design but other designs may be found here on Youtube. It is…
Pancake coil JT– radio transmitter.ASF
This video shows how the “Pancake coil JT” can be used as a short distance AM radio transmitter. I also show how I used a “radio direction finder” method to help navigate to Hawaii…
Electric OU: Supplement: The Quantum 555 Timer Error CORRECTED
Using the exact component values given in the original Quantum schematic, I have shown several times that it produces an inverted duty cycle.. .an EXACTLY inverted duty cycle… from that which is claimed by…
Update 18 NGE Papp: Timer Circuit, New Caps, New Ignition Set Up, General Update.
Update 18 NGE Papp: Timer Circuit, New Caps, New Ignition Set Up, General Update. I stated 1.055″ ment 1.022 and also stated 330uf ment 3300uf each cap… Lack of sleep and time 😉 so…
Low Power 555 timer runs JT
This is a CMOS 555 timer chip running a 1 LED / 1 AA battery JT circuit at less than 10 millamps. This was Kubikop’s idea of a way to further reduce the power…
Wave Trap filter for crystal radio
This shows a crystal radio add on device called a “Wave Trap”. It helps block out an overpowering radio station so that you can hear weaker stations.