THE OP-AMP: The Op-Amp used for the signal meter circuit is a TL061. An LF351 works just as well, however and has the same pin layout. If you have a TL062 or similar the differing pin-outs are shown below so that you can design your circuit board successfully. The diagram above shows the pin layout of the TL061 and some alternative op-amps that ca
Click here to download the full size of the above Circuit.
n also be used in the signal meter circuit described on this page. The LF351 op-amp also works in this design and is pin compatible with theTL061. Another pin compatible op-amp that is usually easy to obtain, or that may be knocking about in the `junk box` is the very common LM741. I have not tried an LM741 in this circuit, but I can see no reason why it would not work. Rather than solder any op-amp directly to the circuit board, I would strongly recommend that you use 8 Pin D. I. L. sockets so that the I. C. can be easily inserted and removed. The 2 power sockets mounted to the right of the back panel are the 12v power input sockets (2 are fitted to allow `daisy-chaining` of the power to another unit) NB - the 0 Volts connection between the negative side of the meter movement and the 0 Volts output from the power regulator circuit should not be connected to the metal case or ground. The small socket on the left is the 2. 5mm Jack that allows connection of the signal meter to the radio. You can just see the single grey wire that connects the 2. 5mm socket to the circuit board. The top half of the board accommodates the signal meter components ( Note how relatively small changes in voltage at the lower end of the scale ( in the S1 to S8 range) produce quite noticable swings in the readings, while really quite large changes in signal voltage at the higher end of the scale ( S9 to S+50 ) produce quite small variations in...
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.....
characters left: