A tribute to legendary analogue circuit designer Bob Pease. This soldering kit from Boldport is an LED flasher circuit built around the LM331 voltage-to-frequency converter chip.
This version uses a circuit built around the LM331, also designed by Pease. It is a single voltage to frequency converter where the setting of the trimmer sets the output frequency that can be observed by the flashing LED. The frequency range using the multi-turn 2MΩ trimmer is about 3Hz to 300Hz.
The circuit itself appears in Application Report SNOA735B, Figure 2. One of the primary advantages of this arrangement is that the output isn’t affected (much) by the supply voltage. The Application Report details other advantages.
Note: requires through-hole soldering!
Pease-out was Project #32 of the Boldport Club.