We find this simple musical instrument in a 1977 Radio Shack documentation. The key resistors must be experimentally obtained in the range of 1 k to 1 M in order to achieve the desired tuning. For 12 V supply. Q2 may be a BD135.
We find this simple musical instrument in a 1977 Radio Shack documentation. The key resistors must be experimentally obtained in the range of 1 k to 1 M in order to achieve the desired tuning. For 12 V supply. Q2 may be a BD135.
