Be aware that if you order a cheap CD40106 from China you may get a repainted 74HC14A instead. If you plan on using it at 5V or less this is fine, but unlike the 74Cxx and CD4000 series chips which have an absolute maximum VCC rating of 18V, the 74HC ones are only good up to 8V. I designed and built an automotive control circuit using a "CD40106" and couldn't figure out why it worked perfectly on the bench (using a 5V supply) but kept failing completely after just a few hours of use in the car at 12V (or 13.8V). It took me a while and a half-dozen fried "40106's" to figure out that my 40106 wasn't actually a 40106. The vendor had simply rebadged 74HC14 chips as CD40106/74C14. Caveat Emptor.
The 74HCU04 which is the un-buffered version of the 'HC04, is praised as capable of low phase noise when used as crystal oscillator. Also, these un-buffered cmos inverters are quite versatile as they behave quite linearly when biased as analog inverter amplifiers.
Hi This took me back to the late 70's.When I left school in the UK, my first job was in ship to shore radio mf hf vhf and am air band.I used to repair the radios and some of them used TTL logic. I still have my first editions of Don Lancaster TTL and Cmos cook books. We started to use 54 series logic as they were mil spec , more expensive but cut the fault rate down. The manufacture of the tx's and rx's started to replace most of the 74,s with 54's
I know I'm being pedantic here, but the original CD4000 series was made by RCA, not Motorola. The number letter designation was C, representing RCA, and the D was for digital. Similar designation to RCA's CA series of analog chips, C for RCA, A for analog. The CD4000 series was probably my favorite logic series, even though it was slow. The CA series analog chips, now pretty much all obsolete, were also some of my favorite analog chips. That series had some chips that had better specs than replacements you can get today, like in some of their electrometer op-amps, and some of their transistor arrays.
My recent use of CD40106 is for a one-button switch, configuring a couple of inverters as a flip-flop. This chip also suites well in anti-bounce push button circuits. My 2 cents 👋😉
One part they never made in the 4000 series was a dual D flip-flop with Schmitt clock inputs. There's a version called the SN74HCS74 that will operate up to 6 volts, but nothing available for higher voltages. Such a part would have found millions of applications.
I love these 4000 series CMOS devices. I still go back to them for essentially "no current draw" circuits when I need something that will run on batteries forever.
The military version of IC's was a ceramic case and the consumer version was in a plastic case. Of course the military version was way more expensive, no surprise there.
I find the the 74HC132 quad Schmitt nAND a more useful component, as it provides a control signal on each gate. It really is a very versatile part, as two gates can be used to produce all the versions of mono-stable or linked together to provide a modulated oscillator output, ideal for sounder alarms.
With a slightly different configuration, as most synth builders will probably know. You can generate a very nice ramp (sawtooth) waveform. And with the addition of a few more components it can be made to track at 1v per octave very nicely....
Just as a suggestion, one simple, but very interesting CD4000 chip you might want to feature, is the CD4007 complementary pair plus inverter. It's been described as a DIY "kit" for interesting cmos circuits. I think Bob Pease back in the day described a cool little op-amp circuit using he 4007. Just a thought.
I've used them for simple pwm LED-dimmer/ DC motor driver circuits. It's the same capacitor relaxation oscillator circuit but with diodes and a potentiometer, to control the pulse width.
Because of their input voltage hysteresis oscillators made by triggers create inherently non-symmetrical square waves. If you want to 50/50 symmetrical square waves you should use two gates. Schmidt triggers are ideal for low/very low frequencies because you can take advantage of their hysteresist. For above 1 MHz you should use either Gates or op amps. Since you have six Schmidt triggers in a chip you can measure lithium ion batteries voltage indicators up to six LEDs.
I've got an old Fluke 8040A DMM that has a similar postive-ground design. It was surprising when I found out; I was in there replacing the very old 7-segment LCD display by adding a retrofit graphical LCD display and microcontroller that wiretapped the signals to the display. It was really... curious, but I suppose made other stuff work out. It was nice that Fluke had full schematics and theory of operation chapter in their manual.
Be aware that if you order a cheap CD40106 from China you may get a repainted 74HC14A instead. If you plan on using it at 5V or less this is fine, but unlike the 74Cxx and CD4000 series chips which have an absolute maximum VCC rating of 18V, the 74HC ones are only good up to 8V. I designed and built an automotive control circuit using a "CD40106" and couldn't figure out why it worked perfectly on the bench (using a 5V supply) but kept failing completely after just a few hours of use in the car at 12V (or 13.8V). It took me a while and a half-dozen fried "40106's" to figure out that my 40106 wasn't actually a 40106. The vendor had simply rebadged 74HC14 chips as CD40106/74C14. Caveat Emptor.
Always look forward to ‘chip of the day’ and it’s always good to have a refresher on the 74 and 40 series ICs. Much appreciated.
The 74HCU04 which is the un-buffered version of the 'HC04, is praised as capable of low phase noise when used as crystal oscillator. Also, these un-buffered cmos inverters are quite versatile as they behave quite linearly when biased as analog inverter amplifiers.
Few years ago I built oscillator using the CD40106 and 100kHz Xtal.
Great video, thanks.
Hi This took me back to the late 70's.When I left school in the UK, my first job was in ship to shore radio mf hf vhf and am air band.I used to repair the radios and some of them used TTL logic. I still have my first editions of Don Lancaster TTL and Cmos cook books. We started to use 54 series logic as they were mil spec , more expensive but cut the fault rate down. The manufacture of the tx's and rx's started to replace most of the 74,s with 54's
I know I'm being pedantic here, but the original CD4000 series was made by RCA, not Motorola. The number letter designation was C, representing RCA, and the D was for digital. Similar designation to RCA's CA series of analog chips, C for RCA, A for analog. The CD4000 series was probably my favorite logic series, even though it was slow. The CA series analog chips, now pretty much all obsolete, were also some of my favorite analog chips. That series had some chips that had better specs than replacements you can get today, like in some of their electrometer op-amps, and some of their transistor arrays.
My recent use of CD40106 is for a one-button switch, configuring a couple of inverters as a flip-flop. This chip also suites well in anti-bounce push button circuits. My 2 cents 👋😉
One part they never made in the 4000 series was a dual D flip-flop with Schmitt clock inputs. There's a version called the SN74HCS74 that will operate up to 6 volts, but nothing available for higher voltages. Such a part would have found millions of applications.
I love these 4000 series CMOS devices. I still go back to them for essentially "no current draw" circuits when I need something that will run on batteries forever.
The military version of IC's was a ceramic case and the consumer version was in a plastic case. Of course the military version was way more expensive, no surprise there.
I find the the 74HC132 quad Schmitt nAND a more useful component, as it provides a control signal on each gate. It really is a very versatile part, as two gates can be used to produce all the versions of mono-stable or linked together to provide a modulated oscillator output, ideal for sounder alarms.
With a slightly different configuration, as most synth builders will probably know. You can generate a very nice ramp (sawtooth) waveform. And with the addition of a few more components it can be made to track at 1v per octave very nicely....
Just as a suggestion, one simple, but very interesting CD4000 chip you might want to feature, is the CD4007 complementary pair plus inverter. It's been described as a DIY "kit" for interesting cmos circuits. I think Bob Pease back in the day described a cool little op-amp circuit using he 4007. Just a thought.
Thank you for showing the breadboard close up. makes it much easier for me to try and duplicate your work on my own bench.
I've used them for simple pwm LED-dimmer/ DC motor driver circuits. It's the same capacitor relaxation oscillator circuit but with diodes and a potentiometer, to control the pulse width.
Because of their input voltage hysteresis oscillators made by triggers create inherently non-symmetrical square waves. If you want to 50/50 symmetrical square waves you should use two gates. Schmidt triggers are ideal for low/very low frequencies because you can take advantage of their hysteresist. For above 1 MHz you should use either Gates or op amps. Since you have six Schmidt triggers in a chip you can measure lithium ion batteries voltage indicators up to six LEDs.
I did'nt know they were the same IC. Thank you.
Good one. Thank you.
I've got an old Fluke 8040A DMM that has a similar postive-ground design. It was surprising when I found out; I was in there replacing the very old 7-segment LCD display by adding a retrofit graphical LCD display and microcontroller that wiretapped the signals to the display. It was really... curious, but I suppose made other stuff work out. It was nice that Fluke had full schematics and theory of operation chapter in their manual.