One thing we should keep in mind is that the EC10 is now a vintage receiver, it has collector appeal. Any-thing we do should really be carried out in a manner that preserves the original state, most of the following adheres to this. Things like replacing all of the Germanium transistors with Silicon devices could be done but this would be considered a radical modification. I have however,
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carried out some tests using a Silicon RF transistor as a replacement for the original Germanium transistor in the 1st RF amplifier. More on this later. The first and most basic thing you should do is replace all of the electrolytic capacitors, as many older types of electro`s are notorious for leakage. Make sure you observe operating voltage and polarity. The BFO circuit was only intended for use with CW and even here a strong signal can cause problems, there`s just not enough coupling. To fix this problem and make SSB reception possible, you need to change C-67 on the IF / AF board from 1pF to 10pF, preferably polystyrene. The result will be a greater level of BFO carrier coupling into the IF. You will need to use the BFO and tuning controls together as to much BFO carrier will swamp weaker signals, (keep AGC on) the fine tune on the later Mk-2 becomes quite useful here. A distinct disadvantage of the EC10 is the lack of an internal mains power supply, there is enough space to add your own but a few points need to be made. Current consumption with the lamps on is around 200 to 250 mA maximum at 9 Volts and regulation of this voltage is recommended as the internal zener regulator is slightly sensitive to input variations. I recommend the use of a small toroidal mains transformer, conventional I-E type transformers are larger and suffer EM field leakage that may cause "Hum" problems. To mount a transformer and supply...
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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