Ramp oscillator (Sawtooth Oscillator) for 30 Hz - 43 KC made with a 555 Chip, demo & schematic скачать в хорошем качестве

Ramp oscillator (Sawtooth Oscillator) for 30 Hz - 43 KC made with a 555 Chip, demo & schematic

Please read the description first, for the best and most complete information. Demo + Schematic of a ramp oscillator (sawtooth generator) made with a 555 Chip and a BD 139, as amplifier. Please don't tell me how I can make this circuit "better", say with a constant current source or so. These kinds of comments will be removed directly, but not (!!) when you give a link to a circuit on your Youtube Channel and show that you have developed & tested such a circuit, with a schematic, a photo or film, a description, etc. Working from 30 Hertz to 43 KC with a bunch of capacitors and a rotary switch. Tested: 0.47 uF = 29 Hertz to 60 Hertz and 300 pF = 43 KC. Everything is showed in the video. NB from pin 6 to ground are the timer capacitors, beween (say) 1 uF and 330 pF. You can switch all these different capacitors (frequencies) on via a rotary switch. Try, test, experiment. It is all very easy to do. Earlier video where this sawtooth generator/ramp oscillator was made with a FET (= Field Effect Transistor, tye BF 256 A) is here:    • Sawtooth Wave Generator 0.5 Hz to 18 KC. O...   That FET circuit works nice and the waveform has a better linearity (!), but sometimes the oscillation does not want to start on frequencies higher than 4 KC (4 KHz). Or: it starts & works when you “switch up” via the rotary switch to the higher frequencies (say higher than 5 KC, via different capacitor values connected to that rotary switch), but when you switch “back” to lower frequencies, the FET oscillator does not want to start. I tested this issue over and over, did many experiments, but could not a find a solution to repair that effect. Has to do with the capacitive properties of the FET BF 256 A under certain supply voltages, that was my final conclusion. Anyway: thus went back to the good old 555 Chip. Linearity of the ramp wave is lower, compared to the FET circuit, but it does not suffer from these (strange) issues, encountered with that FET circuit. Try, test, experiment! When you have better results, comment, I am always interested in real (tested) experimental results, via also making that circuit and adapt it, and via that with certain conclusions. My You Tube channel trailer is here:    • Radiofun232 on YouTube, find working & tes...   Interested in certain electronic circuits? (Radio’s, audio amplifiers, audio pre-amps, audio filters, measuring devices to test transistors and (say) mosfets or (radio) coils or Shortwave and MW radio’s? Go to my Channel Trailer (“Radiofun232 on YouTube”). Type there the keywords that you like (e.g. radio/audio / amplifiers / filter / Shortwave / Short Wave /test / testing) into the “looking glass” = search function” and give “enter”. Via that you can find specific video’s (under the say 1600 published). In almost all video’s a schematic is showed, if so: it is a working and well tested electronic circuit. Keywords (again): ”audio”, “radio”, “amplifier”, “filter”, “Shortwave”, “transistor”, “FET”, “oscillator”, “generator”, “switch”, “schmitt trigger” etc; so the electronic subject you are interested in. My books about electronics & analog radio technology are available via the website of "LULU”, search for author “Ko Tilman” there. Or https://www.lulu.com/search?adult_aud... I keep all my YT videos constant actual. Search on YT and avoid my circuits that are republished, re-arranged, re-edited on other websites, giving not probable re-wiring, etc. I take distance from all kinds of fake claims, made via republishing my circuits via the www. Upload 10 january 2026.