The purpose of this device is to help you sweep an audio or rf filter. It outputs a 0..10V sawtooth that can be used to control a sinus/ function generator or an rf generator. Together with a CRO oscilloscope, a millivolt meter and or power meter this can be used to accurately characterize a […]
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A recent question in a CircuitsOnline thread (link here), raised my interest in the oscillator section of this RF sweep generator. The oscillator section is around the (ECO) emitter coupled oscillator topology. This topology will oscillate at almost any frequency with almost any LC combination and is not critical with transistor types (of course […] […] Usually the workbench is cluttered with oscilloscope probes, serial cables, programming adapters and the like. Before a cable can be used it first needs to be liberated from beneath a pile of projects. While doing so, you accidentally move a wire on your current project which shortens out an essential part of which you […] The usage of inductors in RF circuits is often intrinsic to its operation. Unfortunately, the measurement of small values of inductance is often difficult without specialized equipment. If, you have the ability to measure frequency, either directly with a frequency counter or indirect with an oscilloscope, this burden can easily be overcome. […] Below you see the block diagram for the walkie talkie transmitter. Transmitter block diagram The carrier oscillator is crystal controlled to guarantee sufficient stability. It is much easier to create a frequency stable carrier by means of a crystal than with an ordinary LC oscillator. The latter would require carefull selection of components and […] 
Lately my 6 year old son has gotten interested in walkie-talkies. Now, I could go to the nearest toy-store and buy something but where is the fun in that? Since, he is getting more interested in technology it would be nice to design something that he can, at least to some extend, help me […] 
The Gate Dip Oscillator (GDO) is one of the most useful tools for the radio amateur. You can use it to tune LC circuits, as test RF source, check antennas, etc. This GDO circuits bonanza features many previously unpublished GDO circuits from (primarily) Dutch magazines and books. Bouwen en luisteren – IAN R. SINCLAIR This […] These test probes wereld made several years ago and have proven to be very useful in many applications. The small tip allows you to probe even the tiniest SMT components. Because the tip is really, really sharp (don’t ask me how I know… ouch) it allows you to breach residue of solder flux or […] 
If you like prototyping but find it’s a nuisance to mess around with small, all too common, SMT packages, the Texas Instruments SMT DIP adapter kit might be something for you. The DIP adapter kit supports six of the most popular industry-standard packages, including: D and U (SOIC-8) PW (TSSOP-8) DGK (MSOP-8, VSSOP-8) DBV […] |
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