Coaxial cables are measured by impedance. The most common impedance values are 50 ohms and 75 ohms. different cables. 50 ohms is most often used for radio transmitting and receiving applications. 75 Ohm is primary used for video and audio. 75 Ohm cables are the standard coax cable you find everywhere inside your home and →
Insult your co-workers with snarky O RLY parody book covers! O RLY Cover Generator https://dev.to/rly →
Question seen at Facebook electronics discussion group: I have 12 V ,1A DC Adapter, I want to convert it output up to 3 volts DC Power Supply for a “Gas Geyser Ignition” Circuit. What will be do for it? Easier solution is to get a new transformer / power supply with 3V output. There are →
Uusiteknologia.fi is a Finnish language electronics and technology professionals magazine published on-line. In the newest issue have written articles on many high tech topics (text in Finnish with short introduction in English). Newest issue Uusiteknologia 2/2020 has just been published. I have written two articles to the newest issue. The front page article is about →
I saw this question posted to ELECTRONICS HOBBY CIRCUITS IN FACEBOOK group: “can you tell me what is the meaning of calibration date of a multimeter and does it effect the work of a multimeter if it expires the calibration date?” The answer to this is: As all circuits will drift with time, the DMM →
Test with multi-meter that it is not short circuited. Test with capacitance meter that capacitance value is correct. If this is an electrolytic capacitor I measure ESR. With some electrolytics I charge them to nominal voltage with power supply and measure charging leakage current or the rate it self duscharges. If it is a small →
The Right To Repair is a big issue. IFixit and Louis Rossman have spread the word out how Apple making it difficult to repair products outside their service centers. On Tuesday, Apple hosted its ‘One More thing’ event, unveiling three brand new Apple Silicon Macs running on Apple’s new M1 chip “by far the most →
This is a tear-down of an interesting PIR (passive infra red) sensor found from some unknown light system believed to be powered from 230V AC. The chips used seem to be ST LM2904 low power opamp and TFK U2100 timer control chip. The sensors are PIR sensor and LDR. The most interesting part is that →
A spectrum analyzer measures the magnitude of an input signal versus frequency within the full frequency range of the instrument. The primary use is to measure the power of the spectrum of known and unknown signals. Spectrum analyzers are widely used to measure the frequency response, noise and distortion characteristics of all kinds of radio-frequency →
Facebook post at https://www.facebook.com/groups/electronichobycircuits/permalink/3743513689006646/ advertises this circuit idea: Amazing Idea With Relay & BC547 Transistor https://techsawco.com/amazing-idea-with-relay-bc547-transistor/ I see this circuit much less than amazing. “This circuit is used as voltage level indicator and short circuit protection circuit.” Voltage level indicator idea is feasible. The “short circuit protection circuit” does not live up to the promises →