Here’s a vibe project that I had in my mind for few months. The ideas was to create a kind of vibe circuit without all these Bipolar transistors , photocells, lamp (which take a lot of space) to make a more compact circuit .
We know that a vibe circuit is a modified phaser (or the phaser is a modified univibe , your choise) so why bothering myself with the original big circuit? (actually load of vibe used this modified phaser topology instead of this original vibe circuit , the new hendrix vibe signature from MXR for instance (it’s vibe(d) phase90) and obviously a lot of “boutique” pedal)
So here we are . A classic 4 stages phaser with the cap ratio of the univibe. I used a switch to alter the value of 2 caps to give a more pronouced bassy vibe (the “voodoo vibe” caps). I’ve also incorporated some other things as a tone cut to cut off some trebles and make it sound more like an original vibe (which has a lower impedance and so ….cut the treble of the high input impedance)
It turned out that the result isn’t as great as I thought it would be. Don’t get it wrong, it’s a kind vibe effect but not the same like an all transistor vibe would give . We are more into a kind of vibe-phaser . I guess all the transistor arrangement of the original circuit and the mixing at the end gives its particular sound . I tried to increase the “wet” signal in the output mixer to make the effect more present , but it increases the vibrato effect as well and looses the vibe effect. I’ll try to increase the FLO gain coming into the otas .
The tone control is great to have a warmer effect but not really necessary . I think I’ll improve the circuit and make it more like a maxi-vibe or a rotary effect with more controls on the LFO and tone shaping.
You’ll notice the circuit isn’t compact at all . But still more compact than the orignal univibe circuit . It could be even smaller with a double-side SMD pcb !
So work has to be continued !