We obtained the circuit we present from an Argentine publication of the 1960s. The circuit uses two 12AT7 (Triodos Triodos) valves and generates a signal that modulates the passage of an audio source in order to obtain the vibrato effect. The circuit is very sensitive to noise and all signal connections must be shielded. The transformer is the only critical component, but since it is only 125 V with 15 mA there are solutions, such as those described in article V009. The RF shock can be the primary winding of a small 110 V x 6 V transformer. The diode accepts equivalents such as 1N4004. The signal source enters J2 and the modulated signal exits at J1. The effect frequency setting is done at R3 and the modulation depth is set at R11.
| Haga click en la imagen para ampliar |
