555 as a push-pull level shifter

psmay writes: Wanting to prototype something with an oddball push-pull 3.3V-to-13V switch led me to concoct an experiment using only stuff available at a reasonably well-stocked Radio Shack[3], with particular attention to ICs that provide push-pull outputs. So far I’ve tried configurations based on the original 555 timer[4] and the TL082 op amp. My first […]

Magical music box using CMOS and 555s

Justin Giles-Clark shows off his magical music box using CMOS and 555s: Simple circuit using 555s for a 3minute monostable oscillator to time the clockwork spring. Another 555 provide a astable oscillator with about an 1 hertz period clocking a 4017 decimal ring counter for 6 counts. Created in 2002. Via contact form. Check out the […]

555 based constant current lead-acid battery charger

Kennith needed a 1A constant current lead-acid battery charger for his HAM radios. He augmented the 555 contest winning battery charger circuit by replacing the relay with an LM317 in constant current mode. Since the SLAs are relatively small, and I only need them charged between radio outings, I opted to build a 1A constant […]

RIP Hanz R. Csmenzin – Inventor of the 555 timer

Hans R. Camenzin the inventor of the famous 555 timer IC died at the age of 78: Hans R. Camenzind was an electronics engineer best known for inventing the 555 timer IC in 1970. He was an inventor on 20 US patents. During his career he wrote three textbooks, designed the first integrated class D […]

555 based FPGA/CPLD debugging oscillator

Randomgarfield from fromorbit posted the above video, depicting his use of a 555 timer as a small oscillator tο clock CPLDs whіƖе debugging a small state machine. I needed a variable slow speed clock to help me debug a design I’m creating with a bunch of CPLDs. Given the current focus on the venerable 555 […]