Java Circuit Simulation Workaround ▾

Due to recent changes by Oracle, java applets have become difficult to run in the browser. To mitigate the troubles, Oracle has provided the following websites to help users troubleshoot: and

Even after following the above instructions, loading applets may still show warning concerning “unsigned application” and “unknown publisher”. For Teahlab in particular, these warnings are due to the fact that we have opted not to pay a third party such as Verisign to sign our applets. Any warning that comes up when you try to run our applets should emphasize that our applets will always run with “limited access”, which is Oracle’s way of letting you know that teahlab doesn’t do anything on your computer except running the circuits you see: in other words, our applets are safe to run.


The Teahlab Team

VIDEO TUTORIALS: The Master Slave D Flipflop
by Isai Damier @isaidamier

The master-slave D flipflop is actually two D Latches arranged such that the output of one latch (which we call the master latch) drives the second latch (which we call the slave latch). The clock input controls access both to the master D latch and to the slave D latch. When the clock switch is OFF, the door to the master is opened, while at the same time the door to the slave is closed. Since the door to the master D latch is open, the input switch D now controls the master D latch. But at the same time, the slave D latch is not affected.