Old German radio with Tubes
Posted on Jun 27, 2012
New Circuits
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This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of.... -
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is.... -
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to.... -
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This.... -
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the.... -
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,.... -
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the.... -
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power.... -
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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This is a 40 meter transmitter which uses two valves, the 6AU6 and 6GV8. The construction is...
The output of the amplifier is to be measured on a digital voltmeter. Besides being able to...
Easy to build, this high voltage generator is capable of generating up to 50KV but the breakdown...
The heart of the lock is the 40022 octal counter. When first powered C2 is charged via R5 so the...
In the presence of smoke or gas, the ac output voltage increases and becomes rectified, filtered...
Running from a 9-V battery, this transmitter can be used as a wireless microphone with an...
The frequency is controlled by the pin 5 of the IC. When the supply is switched ON, the capacitor...
This circuit runs a fast battery test without the need of power supply or expensive moving-coil...
The circuit presented here may provide a solution in a number of cases, since it can be used to...
This toy traffic signal uses a single low-cost hex Schmitt-trigger inverter IC (IC1a-IC1f) to...
The ectronic fishing shrimp machine circuit is composed of the astable oscillator, inverter...
At the input of the operational amplifier plus a resistor - diode network can be constructed...
This circuit really is the simplest inducer balancing metal detector (IB, Inductlon Balance) that...
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