This is an example of a cascaded or sequential timer, here two CD4541 are forming a two stage timer. You can add more in a chain, but better to use a microprocessor or Microcontroller for such a purpose. But make sure EMI-RFI immunity is high for these circuits or wrong resets and sets can make a machine like an Oven or Environment Chamber malfunction and even ruin the job.
on: 7/24/2019
It is called analog dial timer as it has no digital display, but the chip is digital it is CD4541. It is Mains operated, you could make on-delay or off-delay. By changing the caps and resistors or with even dip-switches you could get timing of few seconds to many hours.
on: 7/12/2019
Battery level voltage measurement is best done with a dummy load. This circuit has four LEDs to show the charge left. It is important to avoid overcharge or deep discharge of rechargeable batteries. Never try recharging normal batteries. Using rechargeable batteries are good for the environment.
on: 7/11/2019
This circuit is built around the chip CD4067, now called 74HC4067, it works like a single pole 16 throw rotary switch that can be controlled digitally. Clamping protection diodes are built in. Use resistors to enable this protection. 16 Analog channels are controlled by a Digital User Interface circuit made of 4093 and 4029. Up/Down and Auto/Man are four Push-buttons. A LED Display to show the Channel Number that is selected.
on: 6/27/2019
These were some of the Methods i used since the 80s, I had to sell Instruments manufactured by my own small firm. So these Ancient methods are quite Modern if you extrapolate them with tools like the Internet.
on: 7/22/2019
There are Web widgets related to learning electronics and also demonstrating the subtle aspects of Product Design Technologies. This blog also has the widgets made by delabs from the iGoogle days, around 2005. These demonstrate solutions for improving usability in devices.
on: 6/30/2019
If you are a small company you have an ability to grow and improve as adrenaline is working, but many large companies because of inertia lose their core skills this is because they becomes complacent. they shrug off customers and responsibilities. The conclusion is big and small both are equal, one has to consolidate, reform, hive off and be sensible. the other has to be ever look out for opportunities left open.
on: 6/27/2019
delabs Circuits html pages are being slowly migrated to Expression Engine CMS. The delabs html pages are now nearly two decades old (20 yrs). Started with Netscape Composer and later Mozilla Composer and now maintained with Seamonkey and Filezilla. This CMS Expression Engine is from the people who made pmachine. Other nice apps in those days were phpbb, mambo, 4images and cmsimple.
on: 6/13/2019